Methods, apparatus and systems for handling additional power backoff

ABSTRACT

Methods, apparatus and systems are described for a wireless transmit/receive unit (WTRU) to manage its transmission power. A power headroom report (PHR) may be triggered based on changes to backoff or the impacts of backoff. Additional backoff may be used to calculate a maximum output power of the WTRU and may be indicated by a domination indicator to network resources. The WTRU may be configured to eliminate triggers caused by virtual PHRs. Furthermore, the WTRU may be configured to respond to rapid changes to backoff.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.13/345,033 filed Jan. 6, 2012, which claims priority to U.S. ProvisionalApplication No. 61/430,903, filed Jan. 7, 2011, U.S. ProvisionalApplication No. 61/442,095, filed Feb. 11, 2011, U.S. ProvisionalApplication No. 61/466,899, filed Mar. 23, 2011, U.S. ProvisionalApplication No. 61/468,432, filed Mar. 28, 2011, U.S. ProvisionalApplication No. 61/473,635, filed Apr. 8, 2011, and U.S. ProvisionalApplication No. 61/523,113, filed Aug. 12, 2011, the contents of eachbeing incorporated herein by reference.

FIELD OF DISCLOSURE

This application relates to wireless communications and, in particular,methods, apparatus and systems for handling additional power backoff.

BACKGROUND

Power control is used in wireless communication systems to satisfygovernmental regulations and to limit interference between and amongwireless communication devices.

SUMMARY

Methods, apparatus and system are described for managing power headroomreporting associated with a wireless transmit/receive unit (WTRU). Onerepresentative method includes: determining a Power Management PowerReduction (P-PR); determining a backoff value for reducing a value ofmaximum transmission power for the WTRU; and reporting power headroom inaccordance with the determined backoff value.

Another representative method for managing transmission power of awireless transmit/receive unit (WTRU) includes: determining a PowerManagement Power Reduction (P-PR); determining a backoff value forreducing a value of maximum transmission power for the WTRU; andadjusting transmission power in accordance with the determined backoffvalue.

A representative wireless transmit/receive unit (WTRU) configured toreport power headroom, includes a processor configured to: determine aPower Management Power Reduction (P-PR) and determine a backoff valuefor reducing a value of maximum transmission power for the WTRU; and atransmit/receive unit configured to report power headroom in accordancewith the backoff value determined by the processor.

Another representative WTRU configured to manage power headroom reports(PHRs) includes: a processor configured to determine whether a realtransmission is to occur for a component carrier (CC) at a first period;determine a previous period when a real transmission occurred for theCC; compare the P-PR of the CC associated with the first period with theP-PR of the CC associated with the previous period; and trigger a PHR inaccordance with a comparison result.

BRIEF DESCRIPTION OF THE DRAWINGS

A more detailed understanding may be had from the Detailed Descriptionbelow, given by way of example in conjunction with drawings appendedhereto. Figures in such drawings, like the detailed description, areexamples. As such, the Figures and the detailed description are not tobe considered limiting, and other equally effective examples arepossible and likely. Furthermore, like reference numerals in the Figuresindicate like elements, and wherein:

FIG. 1A is a system diagram of an example communications system in whichone or more disclosed embodiments may be implemented;

FIG. 1B is a system diagram of an example wireless transmit/receive unit(WTRU) that may be used within the communications system illustrated inFIG. 1A;

FIG. 1C is a system diagram of an example radio access network and anexample core network that may be used within the communications systemillustrated in FIG. 1A;

FIGS. 2A-2D are diagrams illustrating representative PHR triggeringprocedures as examples of how and when triggering may occur;

FIG. 3A-3C are diagrams illustrating other representative PHR triggeringprocedures as different examples of how and when triggering may occur;

FIG. 4A-4B are diagrams illustrating further representative PHRtriggering procedures as further examples of how and when triggering mayoccur;

FIG. 5 is a diagram illustrating additional PHR representativetriggering procedures using prohibit timers and lookback windows;

FIG. 6 is a diagram illustrating still other PHR representativetriggering procedures using prohibit timers and backoff windows;

FIG. 7 is a diagram illustrating still further PHR representativetriggering procedures using time-to-trigger timers; and

FIGS. 8 and 9 are diagrams illustrating still additional PHRrepresentative triggering procedures using prohibit timers.

FIG. 10 is a flowchart illustrating a representative PHR method;

FIG. 11 is a flowchart illustrating another representative PHR method;

FIG. 12 is a flowchart illustrating a further representative PHR method;

FIG. 13 is a flowchart illustrating an additional representative PHRmethod;

FIG. 14 is a flowchart illustrating a still further representative PHRmethod;

FIG. 15 is a flowchart illustrating a still additional representativePHR method;

FIG. 16 is a flowchart illustrating a still additional representativePHR method;

FIG. 17 is a flowchart illustrating a yet further representative PHRmethod;

FIG. 18 is a flowchart illustrating a yet further representative PHRmethod;

FIG. 19 is a flowchart illustrating a representative power transmissionadjustment method; and

FIG. 20 is a flowchart illustrating a further representative powertransmission adjustment method.

DETAILED DESCRIPTION

Referring to FIG. 1A, the communication system 100 may be a multipleaccess system that provides content, such as voice, data, video,messaging, and/or broadcast, among others, to multiple wireless users.The communication system 100 may enable multiple wireless users toaccess such content through the sharing of system resources, includingwireless bandwidth. For example, the communication system 100 may employone or more channel access methods, such as code division multipleaccess (CDMA), time division multiple access (TDMA), frequency divisionmultiple access (FDMA), orthogonal FDMA (OFDMA), and/or single-carrierFDMA (SC-FDMA), among others.

As shown in FIG. 1A, the communication system 100 may include WTRUs 102a, 102 b, 102 c, 102 d, a radio access network (RAN) 104, a core network106, a public switched telephone network (PSTN) 108, the Internet 110,and other networks 112, although it is contemplated that the disclosedembodiments may use any number of WTRUs, base stations, networks, and/ornetwork elements. Each of the WTRUs 102 a, 102 b, 102 c, 102 d may beany type of device configured to operate and/or communicate in awireless environment. By way of example, the WTRUs 102 a, 102 b, 102 c,102 d may be configured to transmit and/or receive wireless signals andmay include user equipment (UE), a mobile station, a fixed or mobilesubscriber unit, a pager, a cellular telephone, a personal digitalassistant (PDA), a smartphone, a laptop, a netbook, a personal computer,a wireless sensor, and/or consumer electronics, among others.

The communication systems 100 may also include a base station 114 a anda base station 114 b. Each of the base stations 114 a and 114 b may beany type of device configured to wirelessly interface with at least oneof the WTRUs 102 a, 102 b, 102 c, 102 d to facilitate access to one ormore communication networks, such as the core network 106, the Internet110, and/or the other networks 112. By way of example, the base stations114 a and 114 b may be a base transceiver station (BTS), a Node-B, anevolved Node-B (eNB), a Home Node-B (HNB), a Home eNB (HeNB), a sitecontroller, an access point (AP), and/or a wireless router, amongothers. Although the base stations 114 a, 114 b are each depicted as asingle element, it is contemplated that the base stations 114 a and 114b may include any number of interconnected base stations and/or networkelements.

The base station 114 a may be part of the RAN 104, which may includeother base stations and/or network elements (not shown), such as one ormore base station controllers (BSCs), one or more radio networkcontrollers (RNC), and/or one or more relay nodes, among others. Thebase station 114 a and/or the base station 114 b may be configured totransmit and/or receive wireless signals within a particular geographicregion, (e.g., which may be referred to as a cell (not shown)). The cellmay further be divided into cell sectors. For example, the cellassociated with the base station 114 a may be divided into threesectors. In certain representative embodiments, the base station 114 aand/or 114 b may include three transceivers, (e.g., one transceiver foreach sector of the cell). In certain representative embodiments, thebase station 114 a may employ multiple-input multiple-output (MIMO)technology and may utilize multiple transceivers for each sector of thecell.

The base stations 114 a and 114 b may communicate with one or more ofthe WTRUs 102 a, 102 b, 102 c, 102 d over an air interface 116, whichmay be any suitable wireless communication link, (e.g., radio frequency(RF), microwave, infrared (IR), ultraviolet (UV), and/or visible light,among others). The air interface 116 may be established using anysuitable radio access technology (RAT).

The communication system 100 may be a multiple access system and mayemploy one or more channel access schemes, such as CDMA, TDMA, FDMA,OFDMA, and/or SC-FDMA, among others. For example, the base station 114 ain the RAN 104 and the WTRUs 102 a, 102 b, 102 c may implement a radiotechnology such as universal mobile telecommunications system (UMTS)terrestrial radio access (UTRA), which may establish the air interface116 using wideband CDMA (WCDMA). WCDMA may include communicationprotocols such as high-speed packet access (HSPA) and/or evolved HSPA(HSPA+). HSPA may include high-speed DL packet access (HSDPA) and/orhigh-speed UL packet access (HSUPA), among others.

In certain representative embodiments, the base station 114 a and theWTRUs 102 a, 102 b, 102 c may implement a radio technology such asevolved UTRA (E-UTRA), which may establish the air interface 116 usinglong term evolution (LTE) and/or LTE-Advanced (LTE-A).

In certain representative embodiments, the base station 114 a and theWTRUs 102 a, 102 b, 102 c may implement radio technologies such as IEEE802.16 (e.g., worldwide interoperability for microwave access (WiMAX)),CDMA2000, CDMA2000 1X, CDMA2000 evolution-data optimized (EV-DO),Interim Standard 2000 (IS-2000), Interim Standard 95 (IS-95), InterimStandard 856 (IS-856), global system for mobile communications (GSM),enhanced data rates for GSM evolution (EDGE), and/or GSM/EDGE RAN(GERAN), among others.

The base station 114 b may be a wireless router, HNB, HeNB, and/or AP,for example, and may utilize any suitable RAT for facilitating wirelessconnectivity in a localized area, such as a place of business, a home, avehicle, and/or a campus, among others. In certain representativeembodiments, the base station 114 b and the WTRUs 102 c, 102 d mayimplement a radio technology such as IEEE 802.11 to establish a wirelesslocal area network (WLAN). In certain representative embodiments, thebase station 114 b and the WTRUs 102 c, 102 d may implement a radiotechnology such as IEEE 802.15 to establish a wireless personal areanetwork (WPAN). In certain representative embodiments, the base station114 b and the WTRUs 102 c, 102 d may utilize a cellular-based RAT (e.g.,WCDMA, CDMA2000, GSM, LTE, and/or LTE-A, among others), to establish apicocell or femtocell. As shown in FIG. 1A, the base station 114 b mayhave a direct connection to the Internet 110. Thus, the base station 114b may or may not access the Internet 110 via the core network 106.

The RAN 104 may be in communication with the core network 106, which maybe any type of network configured to provide voice, data, applications,and/or voice, over Internet protocol (VoIP) services, among others, toone or more of the WTRUs 102 a, 102 b, 102 c, 102 d. For example, thecore network 106 may provide call control, billing services, mobilelocation-based services, pre-paid calling, Internet connectivity, and/orvideo distribution, among others, and/or may perform high-level securityfunctions, such as user authentication. Although not shown in FIG. 1A,it is contemplated that the RAN 104 and/or the core network 106 may bein direct or indirect communication with other RANs that may employ thesame RAT or a different RAT as those of the RAN 104. For example, inaddition to being connected to the RAN 104, which may be utilizing anE-UTRA radio technology, the core network 106 may be in communicationwith another RAN (not shown) employing a GSM radio technology.

The core network 106 may serve as a gateway for the WTRUs 102 a, 102 b,102 c, 102 d to access the PSTN 108, the Internet 110, and/or othernetworks 112, among others. The PSTN 108 may include circuit-switchedtelephone networks that may provide plain old telephone service (POTS).The Internet 110 may include a global system of interconnected computernetworks and devices that use common communication protocols, such asthe transmission control protocol (TCP), user datagram protocol (UDP)and/or the Internet protocol (IP) in the TCP/IP suite, among others. Theother networks 112 may include wired or wireless communications networksowned and/or operated by one or more service providers. For example, theother networks 112 may include another core network connected to one ormore RANs, which may employ the same RAT or a different RAT as those ofthe RAN 104.

Some or all of the WTRUs 102 a, 102 b, 102 c, 102 d in the communicationsystem 100 may include multi-mode capabilities, e.g., the WTRUs 102 a,102 b, 102 c, and 102 d may include multiple transceivers forcommunicating with different wireless networks over different wirelesslinks. For example, the WTRU 102 c shown in FIG. 1A may be configured tocommunicate with the base station 114 a, which may employ acellular-based radio technology, and with the base station 114 b, whichmay employ an IEEE 802 radio technology. Some or all of the WTRUs 102 a,102 b, 102 c, 102 d in the communication system 100 may communicate withother devices using Bluetooth technology.

FIG. 1B is a diagram illustrating a representative wirelesstransmit/receive unit (WTRU) that may be used within the communicationsystem of FIG. 1A.

Referring to FIG. 1B, the WTRU 102 may include a processor 118, atransceiver 120, a transmit/receive element, (e.g., an antenna), 122, aspeaker/microphone 124, a keypad 126, a display/touchpad 128, anon-removable memory 130, a removable memory 132, a power source 134, aglobal positioning system (GPS) chipset 136, and/or peripherals 138,among others. It is contemplated that the WTRU 102 may include anysub-combination of the foregoing elements while remaining consistentwith various disclosed embodiments.

The processor 118 may be a general purpose processor, a special purposeprocessor, a conventional processor, a digital signal processor (DSP), amicroprocessor, one or more microprocessors in association with a DSPcore, a controller, a microcontroller, an application specificintegrated circuit (ASIC), a field programmable gate array (FPGA)circuit, an integrated circuit (IC), and/or a state machine, amongothers. The processor 118 may perform signal coding, data processing,power control, input/output processing, and/or any other functionalitythat enables the WTRU 102 to operate in a wireless environment. Theprocessor 118 may be coupled to the transceiver 120, which may becoupled to the transmit/receive element 122. Although FIG. 1B depictsthe processor 118 and the transceiver 120, as separate components, theprocessor 118 and the transceiver 120 may be integrated together in anelectronic package or chip.

The transmit/receive element 122 may be configured to transmit signalsto, or receive signals from, a base station (e.g., the base station 114a) over an air interface 116. For example, in certain representativeembodiments, the transmit/receive element 122 may be an antennaconfigured to transmit and/or receive RF signals. In certainrepresentative embodiments, the transmit/receive element 122 may be anemitter/detector configured to transmit and/or receive IR, UV, orvisible light signals, for example. In certain representativeembodiments, the transmit/receive element 122 may be configured totransmit and receive both RF and light signals. The transmit/receiveelement 122 may be configured to transmit and/or receive any combinationof wireless signals.

Although the transmit/receive element 122 is depicted, as a singleelement, the WTRU 102 may include any number of transmit/receiveelements 122. The WTRU 102 may employ, for example, MIMO technology. Incertain representative embodiments, the WTRU 102 may include two or moretransmit/receive elements 122, (e.g., multiple antennas) fortransmitting and/or receiving wireless signals over the air interface116.

The transceiver 120 may be configured to modulate the signals that areto be transmitted by the transmit/receive element 122 and/or todemodulate the signals that are received by the transmit/receive element122. The WTRU 102 may have multi-mode capabilities such that thetransceiver 120 may include multiple transceivers for enabling the WTRU102 to communicate via multiple RATs, such as UTRA and IEEE 802.11, forexample.

The processor 118 of the WTRU 102 may be coupled to, and may receiveuser input data from, the speaker/microphone 124, the keypad 126, and/orthe display/touchpad 128 (e.g., a liquid crystal display (LCD) displayunit and/or organic light-emitting diode (OLED) display unit), amongothers. The processor 118 may also output user data to thespeaker/microphone 124, the keypad 126, and/or the display/touchpad 128,among others. The processor 118 may access information from, and maystore data in, any type of suitable memory, such as the non-removablememory 130 and/or the removable memory 132. The non-removable memory 130may include random-access memory (RAM), read-only memory (ROM), a harddisk, and/or any other type of memory storage device, among others. Theremovable memory 132 may include a subscriber identity module (SIM)card, a memory stick, and/or a secure digital (SD) memory card, amongothers. In certain representative embodiments, the memory may benon-transitory memory.

In certain representative embodiments, the processor 118 may accessinformation from, and store data in, memory that is not physicallylocated on the WTRU 102, such as on a server or a home computer (notshown).

The processor 118 may receive power from the power source 134, and maybe configured to distribute and/or to control the power to the othercomponents in the WTRU 102. The power source 134 may be any suitabledevice for powering the WTRU 102. For example, the power source 134 mayinclude one or more dry cell batteries (e.g., nickel-cadmium (NiCd),nickel-zinc (NiZn), nickel metal hydride (NiMH), and/or lithium-ion(Li-ion), among others), solar cells, and/or fuel cells, among others.

The processor 118 may be coupled to the GPS chipset 136, which may beconfigured to provide location information (e.g., longitude andlatitude) regarding the current location of the WTRU 102. In additionto, or in lieu of, the information from the GPS chipset 136, the WTRU102 may receive location information over the air interface 116 from abase station (e.g., base stations 114 a, and/or 114 b) and/or maydetermine its location based on the timing of the signals being receivedfrom two or more nearby base stations. The WTRU 102 may acquire locationinformation by way of any suitable location-determination method whileremaining consistent with various disclosed embodiments.

The processor 118 may be coupled to other peripherals 138, which mayinclude one or more software and/or hardware modules that may provideadditional features, functionality, and/or wired or wirelessconnectivity. For example, the peripherals 138 may include anaccelerometer, an e-compass, a satellite transceiver, a digital camera(for photographs or video), a universal serial bus (USB) port, avibration device, a television transceiver, a hands free headset, aBluetooth® module, a frequency modulated (FM) radio unit, a digitalmusic player, a media player, a video game player module, and/or anInternet browser, among others.

FIG. 1C is a diagram illustrating a representative radio access networkand a representative core network that may be used within thecommunication system of FIG. 1A. The RAN 104 may employ an E-UTRA radiotechnology to communicate with the WTRUs 102 a, 102 b, and 102 c overthe air interface 116, although any number of WTRUs may be possible. TheRAN 104 may also be in communication with the core network 106. The RAN104 may include eNBs 140 a, 140 b, 140 c, although the RAN 104 mayinclude any number of eNBs while remaining consistent with variousembodiments. The eNBs 140 a, 140 b, 140 c may each include one or moretransceivers for communicating with the WTRUs 102 a, 102 b, 102 c overthe air interface 116. In certain representative embodiments, the eNBs140 a, 140 b, 140 c may implement MIMO technology. The eNB 140 a, forexample, may use multiple antennas to transmit wireless signals to,and/or receive wireless signals from, the WTRU 102 a.

Each of the eNBs 140 a, 140 b, and 140 c may be associated with aparticular cell (not shown) and may be configured to handle radioresource management decisions, handover decisions, and/or scheduling ofusers in the UL and/or DL, among others. As shown in FIG. 1C, the eNBs140 a, 140 b, 140 c may communicate with one another over an X2interface.

The core network 106 shown in FIG. 1C may include a mobility managemententity (MME) 142, a serving gateway 144, and/or a packet data network(PDN) gateway 146, among others. Although each of the foregoing elementsare depicted as part of the core network 106, it is contemplated thatany of these elements may be owned and/or operated by an entity otherthan the core network operator.

The MME 142 may be connected to each of the eNBs 140 a, 140 b, and 140 cin the RAN 104 via an S1 interface and may serve as a control node. Forexample, the MME 142 may be responsible for authenticating users of theWTRUs 102 a, 102 b, 102 c, bearer activation/deactivation, and/orselecting a particular serving gateway during an initial attach of theWTRUs 102 a, 102 b, 102 c, among others. The MME 142 may also provide acontrol plane function for switching between the RAN 104 and other RANs(not shown) that employ other radio technologies, such as GSM or WCDMA.

The serving gateway 144 may be connected to each of the eNBs 140 a, 140b, and 140 c in the RAN 104 via the S1 interface. The serving gateway144 may generally route and forward user data packets to/from the WTRUs102 a, 102 b, 102 c. The serving gateway 144 may perform otherfunctions, such as anchoring user planes during inter-eNB handovers,triggering paging when DL data is available for the WTRUs 102 a, 102 b,102 c, and/or managing and/or storing contexts of the WTRUs 102 a, 102b, 102 c, among others.

The serving gateway 144 may be connected to the PDN gateway 146, whichmay provide the WTRUs 102 a, 102 b, 102 c with access to packet-switchednetworks, such as the Internet 110, to facilitate communications betweenthe WTRUs 102 a, 102 b, 102 c and IP-enabled devices.

The core network 106 may facilitate communications with other networks.For example, the core network 106 may provide the WTRUs 102 a, 102 b,102 c with access to circuit-switched networks, such as the PSTN 108, tofacilitate communications between the WTRUs 102 a, 102 b, 102 c andtraditional land-line communications devices. For example, the corenetwork 106 may include, or may communicate with, an IP gateway, (e.g.,an IP multimedia subsystem (IMS) server), that may serve as an interfacebetween the core network 106 and the PSTN 108. The core network 106 mayprovide the WTRUs 102 a, 102 b, 102 c with access to other networks 112,which may include other wired or wireless networks that are owned and/oroperated by other service providers.

In wireless communications, for example in wireless communicationsaccording to Third Generation Partnership Project (3GPP) long termevolution (LTE) Release 8 (R8) and Release 9 (R9), a single carrier maybe used in each of the uplink (UL) and/or the downlink (DL). In ULtransmissions, a wireless transmit/receive unit (WTRU) may perform powercontrol based on a number of factors which may include: (1) measuredpathloss on the DL carrier; (2) transmit power control (TPC) commands(e.g., from the eNodeB (eNB)); (3) the number of resource blocks onwhich it may transmit; and/or (4) other static or semi-staticparameters, among others.

The static or semi-static parameters may be provided by the eNB or othernetwork resources. The parameters and/or the power control formulaand/or the power control procedure may be established based on or foundin, for example, LTE or Advanced Long Term Evolution (LTE-A) standards.The power control procedure may account for a possibility that thecalculated transmit power of the WTRU may exceed its maximum allowedtransmit power and may provide that the WTRU scale back the transmitpower so as not to exceed the maximum allowed transmit power.

The maximum allowed transmit power (or the configured maximum outputpower), P_(CMAX), may be a function of the power class of the WTRU, apower limit that may be signaled by the eNB 140 and power reductions theWTRU may be permitted to make which may be based on the signals to betransmitted by the WTRU to, for example, avoid exceeding out of bandemissions requirements or allowed values or levels. For example, forLTE/LTE-A transmissions, the WTRU may reduce its maximum output powerbased on Maximum Power Reductions (MPR) and/or additional MPR (A-MPR)and/or an allowed tolerance ΔTc. MPR, A-MPR, and ΔTc values may be foundin the LTE/LTE-A standards. Which values the WTRU may use may be basedon a combination of one or more of certain transmission characteristicsand signaling from the eNB 140. The values may be considered by the WTRUto be maximum allowed values and as such the WTRU may use the MPR,A-MPR, ΔTc values and/or other lesser values.

The WTRU 102 may provide power headroom (PH) reports to the eNB 140, forexample, to assist the eNB 140 in making scheduling choices. The WTRUmay, for example, provide PH reports periodically and/or based ontriggering events or conditions, among others. The power headroomreports may be provided based on certain triggering events, for examplepathloss changes (e.g., large pathloss changes). The power headroom maybe the difference between the calculated transmit power of the WTRU andits configured maximum output power that may include an actual powerreduction taken by the WTRU. The actual power reduction may be less thanor equal to the combined MPR, A-MPR and ΔTc values. It is contemplatedto extend the power control and power headroom functions to supportcarrier aggregation, for example in Release 10 of the LTE-A standards.

A WTRU supporting carrier aggregation, for example according to LTERelease 10 (R10), may be configured with one or more serving cells (orcomponent carriers (CCs)) and for each CC the WTRU may be configured forUL communication. It is contemplated that the CC and the serving cellmay be used interchangeably and still be consistent with the embodimentscontained herein.

A WTRU may perform power control (PC) for each UL channel on eachcomponent carrier (or CC), c. There may be a configured maximum outputpower, P_(CMAX,c), for each UL carrier (or CC). There may be more thanone P_(CMAX,c) for an UL CC, for example for a primary CC. A WTRU mayperform PC on a subframe basis and may determine (e.g., only determine)the power for channels for which it is to make or will make an ULtransmission in the subframe.

The WTRU may report the power headroom (PH) for each carrier (or CC) andthe PH may be the difference between P_(CMAX,c) and the calculated powerfor the CC prior to scaling. The WTRU may report more than one PH valuefor a CC, for example for a primary CC. A WTRU may report PH for a CC,for example, regardless of whether it is to transmit or will transmit onany channels of that CC when the PH is reported. When a PH report (PHR)is for a CC for which there is no actual transmission, the report may becalled a virtual PHR. A virtual PH, for example, a PH for a CC for whichthere is no actual UL grant in the subframe in which the PHR is totransmit or will be transmitted, may be determined using a referencegrant.

The P_(CMAX,c) may be reported together with some or all per-componentcarrier (CC) PHRs. The P_(CMAX,c) may be the value used for thecalculation for the reported per-CC PH. In certain representativeembodiments, P_(CMAX,c) may not be reported for one or more CCs forwhich virtual PH may be reported.

It is contemplated that additional power backoff to P_(CMAX,c) may beimplemented, for example, to ensure that Specific Absorption Rate (SAR)thresholds or requirements may be met and that transmission thresholdsor requirements related to the WTRU 102 simultaneously operating on LTEand other air interfaces, such as 1xRTT and/or 1xEV-DO, among others,may also be met.

It is contemplated for the P_(CMAX,c) to take into account powermanagement related (or based) additional backoff applied by the WTRU102. In certain representative embodiments, procedures may be set forthfor the additional power backoff and the P_(CMAX,c) may be defined basedon the additional power backoff. It is contemplated to specifyprovisioning or requirements for the additional power backoff.

The triggers for PH reporting may be periodic, upon configuration orreconfiguration, upon pathloss change (e.g., significant pathlosschange), and/or upon secondary cell activation, among others. Certaintriggers, for example a pathloss change trigger, may occur (e.g., onlyoccur) outside the prohibit window of a previous PHR, for example when aprohibit timer for PHR is expired.

It is contemplated to implement additional power backoff (e.g., due toSAR, 1X (for example 1xRTT or 1xEV-DO) and/or other technologies, amongothers). Applying, and then sometime later removing, the additionalbackoff may result in the value of P_(CMAX,c) changing fromtime-to-time. It is contemplated to include a new PHR trigger that isbased on a change in P_(CMAX,c) to inform the eNB 140 when theadditional backoff changes.

In certain representative embodiments, representative methods andrepresentative procedures may be implemented for handling backoff due toSAR, multi-RAT transmission including 1X (for example 1xRTT or 1xEV-DO)transmission, and/or other reasons not addressed (or impacted) by MPR,A-MPR, and ΔTc. The backoff may sometimes be referred to herein asnon-MPR backoff, power management based backoff, power managementbackoff, power backoff due to power management, power management powerreduction (P-MPR or PMPR), P-MPR backoff, additional power backoff, oradditional backoff.

For the case of inter-band carrier aggregation, one or more of the MPR,A-MPR, ΔTc, and/or additional power backoff may be different for eachband (e.g., per frequency band), which may result in reducing orlimiting transmit power per band (e.g., the limits or reductions may bedifferent for each frequency band). It is contemplated to haverepresentative methods and representative apparatus for handling maximumpower limits per frequency band when a WTRU 102 may be operating in morethan one frequency band.

Uplink Control Information (UCI), which may include acknowledgement(ACK)/negative acknowledgement (NACK), channel state information (CSI),and/or scheduling request (SR), among others, may be transmitted by theWTRU 102 to the eNB 140. In a given subframe, when simultaneous physicaluplink control channel (PUCCH) and physical uplink shared channel(PUSCH) is not configured (which may mean or indicate that the WTRU maynot transmit simultaneously on PUCCH and PUSCH), a UCI (e.g., any UCI)may be transmitted on the PUSCH if there is a PUSCH to be transmitted inthe subframe. In certain representative embodiments, for example whenthere is no PUSCH to be transmitted in the subframe, the UCI may betransmitted on the PUCCH. In certain representative embodiments, whensimultaneous PUCCH and PUSCH is configured (which may mean or indicatethat the WTRU may transmit simultaneously on PUCCH and PUSCH), certainUCI (e.g., ACK/NACK) may be transmitted on PUCCH regardless of therebeing a PUSCH to be transmitted in the subframe. The UCI may not becarried on more than one PUSCH in a given subframe. The WTRU 102 mayscale the power of PUSCHs (e.g., all PUSCHs) without UCI equally.

The UCI may be transmitted simultaneously on the PUCCH and the PUSCH.

Representative methods and representative procedures may be implementedfor preventing the WTRU 102 from exceeding maximum transmit power whenthe UCI is transmitted simultaneously on the PUCCH and the PUSCH, forone-band and/or for multiple-band operations.

Certain representative methods and certain representative apparatus mayenable, for example: (1) inclusion of additional backoff in theP_(CMAX,c) and/or P_(CMAX) limits; (2) inclusion of additional backoffin the determination of P_(CMAX,c); (3) triggering a PHR based onchanged additional backoff; (4) eliminating PHR triggers, which may beunnecessary or not useful triggers, which may be caused by virtual PHR;(5) determining when to apply the additional backoff to P_(CMAX,c) foruse in power control and PHR; (6) handling rapidly changing additionalbackoff; (7) handling virtual PHR when there is additional backoff; (8)addressing maximum power per WTRU and maximum power per CC, (9)preventing the WTRU 102 from exceeding a maximum transmit power, withthe UCI simultaneously on the PUCCH and the PUSCH for one-bandoperation; (10) handling maximum power when a WTRU 102 may be operatingin more than one band, for example in inter-band carrier aggregation;and/or (11) preventing the WTRU 102 from exceeding a maximum transmitpower with the UCI simultaneously on the PUCCH and the PUSCH formultiple band operation, among others.

One of skill in the art understands that the above examples may beapplied either individually or in any combination.

It is contemplated that any of the power backoff values described hereinas CC specific, such as MPR, A-MPR, ΔT_(C), power management backoff andthe like may be the same for all CCs or for all CCs in a group, such asin a given band. For the given value or values that are the same, thesubscript representing the CC (c is used for example herein) may bedropped or may be replaced by another, such as one representing a groupor band-specific value.

It is contemplated that the calculations (e.g., all of the calculations)described herein may be performed in a specific subframe, e.g., subframei. Each value in the calculation equation may be the value that appliesto that specific subframe i or may be a value that applies to allsubframes or to a specific set of subframes. Notation may be modifiedaccordingly and still be in accordance with the representativeembodiments described herein.

It is contemplated that the term P_(CMAX,c) may be used to represent theconfigured maximum output power for serving cell (or CC) c. The LTEspecifications have defined two versions of this value for the purposeof power headroom calculations where the version and associatedcalculations of power headroom used depend on which channels are present(i.e., are to be transmitted) on the CC. The two versions are referredto as P_(CMAX,c) and {tilde over (P)}_(CMAX,c) in the specifications. Incertain representative embodiments relating to power headroom that mayinclude, for example, calculations, triggering, and the like, P_(CMAX,c)may be used to represent the configured maximum output power for a CC cin one or more of these currently defined versions or any other versionsthat may be defined in the future. Further, Pcmax,c, P_(CMAX),c,PCMAX,c, P_(CMAX,c), and other combinations of upper and lowercase, useor non-use of subscript notation for c, and fonts, may be used torepresent the same quantities.

It is contemplated that the term P_(CMAX) may be used to represent theconfigured maximum output power of the WTRU. Pcmax, P_(CMAX), P_(CMAX)and other combinations of upper and lowercase and fonts may be used torepresent the same quantities.

In certain representative embodiments, additional backoff may beincluded in P_(CMAX) limits as described below and/or P_(CMAX,c) limitsdescribed later.

In a representative LTE example, the WTRU 102 may be allowed to set itsconfigured maximum output power P_(CMAX). The configured maximum outputpower P_(CMAX) may be set within the following bounds:

P _(CMAX) _(—) _(L) ≦P _(CMAX) ≦P _(CMAX) _(—) _(H);  Equation (1)

where

-   -   P_(CMAX) _(—) _(L)=MIN{P_(EMAX)−ΔT_(C),        P_(PowerClass)−MPR−A-MPR−ΔT_(C)}    -   P_(CMAX) _(—) _(H)=MIN{P_(EMAX), P_(PowerClass)}    -   P_(EMAX) may be a power limit value signalled to the WTRU for        example by the eNB 140 via higher layer signalling such as RRC        signalling. P_(EMAX) may be the value given by the information        element (IE) P-Max.    -   P_(PowerClass) may be the maximum WTRU power without taking into        account a specified tolerance    -   MPR and A-MPR may be specified allowed maximum power reduction        values ΔT_(C) may be a tolerance value that the WTRU may use,        for example when the UL transmission bandwidth may be confined        near the edge of the UL transmission band. For example, ΔT_(C)        may be a value such as 1.5 dB when the UL transmission bandwidth        is confined within 4 MHz of the transmission band edges which        may be represented by F_(UL) _(—) _(low) and F_(UL) _(—)        _(low)+4 MHz or F_(UL) _(—) _(high)−4 MHz and F_(UL) _(—)        _(high). ΔT_(C) may be 0 dB otherwise.

Representative modifications for including non-MPR effects (e.g.,associated with power management based backoff or additional backoff)may include the following representative examples. Representativeexample 1 for handling non-MPR power backoff may be that the additionalbackoff is an additional term. For example, the allowed lower limit maybe:

P _(CMAX) _(—) _(L)=MIN{P _(EMAX) −ΔT _(C) ,P _(PowerClass)−MPR−A-MPR−ΔT_(C)−nonMPR}.  Equation (2)

Representative example 2 for handling non-MPR power backoff may be thatthe additional backoff is in parallel with the MPR reduction (which mayinclude MPR and A-MPR). For example, the allowed lower limit may be:

P _(CMAX) _(—) _(L)=MIN{P _(EMAX) −ΔT _(C) ,P_(PowerClass)−MAX{MPR+A-MPR,nonMPR}−ΔT _(C)};  Equation (3)

where “nonMPR” may be the backoff needed or used to satisfy RF exposurelimits or requirements for Specific Absorption Rate (SAR), limitinterference with other technologies (e.g., 1x EV-DO) and/or, forexample, handle other effects not related to MPR, A-MPR, and ΔTc.

If there are multiple “non-MPR” effects existing simultaneously, thoseeffects may be additive (with MPR effects and/or each other) and/or inparallel (with MPR effects and/or each other). An example of additive Neffects may be: nonMPR=nonMPR-1+nonMPR-2+ . . . +nonMPR-N and, forexample, such nonMPR or its equivalent (e.g., using individual nonMPR-ivalues) may be used in one or more of the equations herein.

An example of parallel N effects may be: nonMPR=MAX (nonMPR-1, nonMPR-2,. . . nonMPR-N) and, for example, such nonMPR, or its equivalent (e.g.,using the individual nonMPR-i values) may be used in one or more of theequations herein.

It may be possible that one or more effects may be additive and one ormore effects may be in parallel. In that case, the equations may becombined. For example:

P _(CMAX) _(—) _(L)=MIN{P _(EMAX) −ΔT _(C) ,P_(PowerClass)−MAX{MPR+A-MPR+nonMPRadditive,nonMPRparallel}−ΔT_(C)}.  Equation (4)

Equation 4 may also be considered a generic equation in thatnonMPRadditive may be an individual effect, the sum of multiple effects,the largest of multiple effects, or another combination of multipleeffects. NonMPRadditive may also be 0, not present, or the equivalent.NonMPRparallel may be an individual effect, the sum of multiple effects,the largest of multiple effects, or another combination of multipleeffects. NonMPRparallel may also be 0, not present, or the equivalent.

In certain representative embodiments, the additional backoff may beincluded in the determination of P_(CMAX,c). as described herein.

For the case of transmitting signals (e.g., LTE signals), the WTRU 102may be allowed to set its maximum output power P_(CMAX) and/or per-CCmaximum output power P_(CMAX,c) (for example when supporting carrieraggregation), within specified limits. As a function of the signalsbeing transmitted and of the configuration, the WTRU 102 may bepermitted to reduce its maximum output power per CC to, for example,avoid exceeding out-of-band emission limits. The WTRU 102, based on itsimplementation, may use the allowed power reduction (e.g., full allowedpower reduction), or a lesser value. In each subframe, i, for a givenCC, the WTRU 102 may determine its power reduction (e.g., required powerreduction) based on a configuration (e.g., LTE configuration) andgrants, for example MPR_(actual,c)(i), and may determine the maximumallowed output power in the subframe. A representative example of how animplementation may determine the maximum output power per CC is providedin Equation 5 set forth below.

P _(CMAX,c)(i)=MIN{P _(EMAX,c) ,P _(PowerClass)−MPR_(actual,c)(i)−ΔT_(C,c)};  Equation (5)

where

-   -   P_(EMAX,c) may be a maximum power limit signalled by higher        layers (for the CC), for example signalled to the WTRU by the        eNB 140.    -   P_(PowerClass) may be the maximum WTRU output power for the        class of the WTRU.    -   MPR_(actual,c) may be the actual power reduction the WTRU took        due to MPR and/or A-MPR effects (for the CC).    -   ΔT_(C,c) may be a fixed power offset that is a function of the        transmission bandwidth (BW) (for the CC).

How the additional power backoff for SAR, other radio technologies,and/or other non-MPR effects may be included in the WTRU's determinationof P_(CMAX,c), is described in the following representative examples.

In certain representative embodiments, the non-MPR backoff may be anadditional term. For example:

P _(CMAX,c)(i)=MIN{P _(EMAX,c) ,P_(PowerClass)−MPR_(actual,c)(i)−Pbackoff,c(i)−ΔT _(C,c)};  Equation (6)

where Pbackoff,c(i) may be the additional backoff for CC c in subframei.

If there are multiple backoffs due to multiple effects, they may beadditive. For example, Pbackoff,c(i) may be the composite (e.g.,algebraic composite and/or sum) of the individual backoffs (or theadditional backoffs). The additional backoffs may additionally oralternatively be included individually in the equation to achieve theadditive effect.

In certain representative embodiments, the non-MPR backoff may not be inaddition to the MPR reduction (e.g., which may include MPR and/or A-MPRreductions) but may be in parallel with the MPR reduction so that ineffect the larger (or largest) of the 2 or more reductions may be used.For example:

P _(CMAX,c)(i)=MIN{P _(EMAX,c) ,P_(PowerClass)−MAX(MPR_(actual,c)(i),Pbackoff,c(i))−ΔT _(C,c)};  Equation(7)

where Pbackoff,c(i) may be the additional backoff for CC c in subframei.

If there are multiple backoffs due to multiple effects, they may be inparallel (e.g., all in parallel). For example, Pbackoff,c(i) may be themaximum of the individual backoffs (or the additional backoffs). Theadditional backoffs may additionally or alternatively be includedindividually in Equation 7 such that the result may be the maximum ofthe backoffs (e.g., all of the backoffs), including the MPR backoff(e.g., which may include MPR and/or A-MPR backoffs).

It is observed that if the example related to Equation 7 is used, if theadditional backoff is less than the MPR backoff, the P_(CMAX,c) may notbe affected by changes in additional backoff.

In certain representative embodiments, one or more of the non-MPRbackoffs may be additive (with the MPR backoff and/or with each other)and one or more non-MPR backoffs may be in parallel (with the MPRbackoff and/or each other). In this case, the various representativeexamples may be combined. For example:

P _(CMAX,c)(i)−MIN{P _(EMAX,c) ,P_(PowerClass)−MAX(MPR_(actual,c)(i)−PbackoffAdditive,c(i),PbackoffParallel,c(i))−ΔT_(C,c)}  Equation (8)

Equation 8 may be considered a generic equation in thatPbackoffAdditive,c(i) may be an individual effect, the sum of multipleeffects, the largest of multiple effects, or another combination ofmultiple effects. PbackoffAdditive,c(i) may also be 0, not present, orthe equivalent. PbackoffParallel,c(i) may be an individual effect, thesum of multiple effects, the largest of multiple effects, or anothercombination of multiple effects. PbackoffParallel,c(i) may also be 0,not present, or the equivalent.

In certain representative embodiments, triggering PHR due to changedadditional backoff may be implemented.

In some cases, such as when the additional backoff is additive with theMPR backoff, as in the first representative example above, providing theP_(CMAX,c) to the eNB 140 (e.g., in a PHR when the additional backoffchanges sufficiently) may provide useful information.

In other cases, such as when the additional backoff is in parallel withthe MPR backoff, as in the second representative example above, and theMPR backoff dominates, providing the P_(CMAX,c) to the eNB 140 when theadditional backoff changes may not be useful. If the additional backoffdominates, it may be useful for the eNB 140 to understand (e.g., betold) when there is a sufficiently large change.

Regardless of how the additional non-MPR backoff is included, it may beuseful to the eNB scheduler to know when there is a large change in howthe additional backoff affects the P_(CMAX,c). The following exampleembodiments may be used to inform the eNB 140 when there is asignificant change in how the additional backoff affects the P_(CMAX,c).

Representative example 1 may include a PHR trigger when the impact ofthe additional backoff on a P_(CMAX,c) changes by more than a threshold,for example, by computing P_(CMAX,c) with the additional non-MPR backoffand without the additional backoff, and then trigger PHR when the deltabetween the two changes by more than a threshold. This example may beshown as follows:

Time 0 (last PHR report):

Compute:

P _(CMAX,c) with non-MPR backoff−P _(CMAX,c) without non-MPRbackoff=K0  Equation (9)

Time i (some subframe i since last PHR):

Compute:

P _(CMAX,c) with non-MPR backoff−P _(CMAX,c) without non-MPRbackoff=Ki  Equation (10)

If |Ki−K0|>threshold, trigger PHR.

For non-MPR backoff greater than or equal to zero, K0, Ki≦0

In this example, the thresholds for positive and negative delta betweenthe two values may be the same.

In another example, the P_(CMAX,c) may be computed with the additionalbackoff and without the additional backoff and the PHR may be triggeredwhen the positive delta or the negative delta between the two changes bymore than a threshold where the positive and negative thresholds aredifferent. This example may be shown as follows:

Perform the computations as above in Equations 9 and 10.

Then:

If Ki−K0>threshold_positive, trigger PHR.

If Ki−K0<threshold_negative, trigger PHR.

It may be possible that there is only one threshold, and a correspondingtrigger of PHR, for a positive delta or a negative delta (e.g., only athreshold_positive or a threshold_negative, and not both).

The trigger may be on a CC basis such that a PHR may be triggered if anythreshold is exceeded for any CC. The trigger may be on a WTRU basis.For example, the P_(CMAX) with and without the non-MPR backoff may beused to determine whether to trigger PHR instead of using the CCspecific P_(CMAX,c) criteria. For example, if the CCs (e.g., all CCs)have the same MPR backoff and non-MPR backoff, use of the P_(CMAX) mayresult in the same effect.

In the following example, upon sending the PHR, the WTRU may computeand/or may store the following:

PMPRimpact,c(0)=P _(CMAX,c) −P _(CMAX,c) _(—) noPMPR;  Equation (11)

where P_(CMAX,c) _(—) noPMPR=P_(CMAX,c) computed with PMPR=0.

For each transmission timing interval (TTI) (or for only the TTIs thatare associated with or have an UL grant), the WTRU may compute thefollowing:

PMPRimpact,c(1)=P _(CMAX,c) −P _(CMAX,c) _(—) noPMPR.  Equation (12)

If |PMPRimpact,c(1)−PMPRimpact,c(0)|>threshold, trigger PHR. The PHR maybe triggered if the threshold is crossed for any CC. In certainrepresentative embodiments, the impact may be computed for the WTRU 102as a whole. In that case, the CC subscript of c may be removed and thetrigger may be based on the WTRU 102 specific determination of thethreshold being crossed (e.g., using P_(CMAX) instead of P_(CMAX),c).

In another example, the case in which the MPR backoff and the non-MPRbackoff are in parallel may be shown as set forth in Equation 13:

P _(CMAX,c)(i)=MIN{P _(EMAX,c) ,P_(PowerClass)−MAX(MPR_(actual,c)(i),Pbackoff,c(i))−ΔT _(C,c)}.  Equation(13)

In this example, in any given subframe i, either the effect of the MPRbackoff, which may include MPR and/or A-MPR, or the non-MPR backoff maydominate. M may represent the MPR backoff, for example, Mj may be usedat time j. P may represent the non-MPR backoff, and for example, Pj maybe used at time j. M and P may be CC specific or applicable to the WTRU102 as a whole. Time=0 may represent when the last PHR was sent. Time=1may represent some time, for example, some number of subframes, sincethe last PHR was sent. There may be at least 4 possible relationshipsamong the values of M and P.

FIG. 2A-2D are diagrams illustrating representative trigging conditionsfor the WTRU 102 to trigger PHR. FIG. 2A relates to Case 1, as set forthbelow. FIGS. 2B-2D relate to Case 2, as set forth below. FIGS. 2A-2Dshow example relationships between MPR backoff (M) and non-MPR backoff(P) and their resulting impacts on PHR Triggering when M initiallydominates.

FIGS. 3A-3C are diagrams illustrating other representative triggeringconditions for the WTRU 102 to trigger PHR. FIGS. 3A-3C relate to Case3, as set forth below. FIGS. 4A and 4B are diagrams illustrating furtherrepresentative triggering conditions for the WTRU 102 to trigger PHR.FIGS. 4A and 4B relate to Case 4, as set forth below. FIGS. 3A-3C and4A-4B show example relationships between MPR backoff (M) and non-MPRbackoff (P) and their resulting impacts on PHR triggering when Pinitially dominates.

For each case, it is indicated if and when the WTRU 102 may trigger aPHR in this example.

-   -   Case 1: M0>P0, M1>P1; in this case, M dominates both at time 0        and at time 1 and a trigger is not useful or not needed; the        WTRU may not trigger a PHR in this case.    -   Case 2: M0>P0, M1<P1; in this case, M dominates at time 0 and P        dominates at time 1; the WTRU may trigger a PHR if P1−M1>a        threshold.    -   Case 3: M0<P0, M1>P1; in this case, P dominates at time 0 and M        dominates at time 1; the WTRU may trigger a PHR if P0−M0>a        threshold.    -   Case 4: M0<P0, M1<P1; in this case, P dominates both at time 0        and time 1; the WTRU may trigger PHR if |(P1−M1)−(P0−M0)|>a        threshold.

The thresholds for each case may be the same or different. FIGS. 2 and 3provide examples of how and when triggering may occur in these cases.The previous example in this section would achieve the same effect inthe case of parallel MPR backoff and non-MPR backoff, but using adifferent formula.

In FIGS. 2A-2D and 3A-3C and 4A-4B, the triggering procedures may becompared to other procedures for triggering PHR, for example a triggerbased on delta P_(CMAX,c) and a trigger based on delta P. Therepresentative procedures based on cases 1-4 may avoid unnecessary ornot useful triggers and provide necessary or useful triggers relative tothe other procedures based on delta P_(CMAX,c) and/or delta P.

Referring now to FIG. 2A, for representative triggering condition 200Aat a first time T0, M0 may dominate P0 and at a second time T1, M1 mayincrease relative to M0 and P1 may increase relative to P0. At time T1,M1 may dominate P1. The change in P_(CMAX,c) and P may be large, but thenon-MPR (e.g., SAR related) backoff may have no effect on P_(CMAX,c).The change in P_(CMAX,c) based on the change in MPR backoff may beexpected or near what is expected by the eNB 140. A PHR trigger may notbe useful and/or needed due to the change in non-MPR backoff. References2A-1, 2A-2, and 2A-3 indicate various descriptions associated with FIG.2A. Reference 2A-1 describes that: Trigger due to change in non-MPR(e.g., SAR) not useful and that Same as what network expects based onMPR. Reference 2A-2 describes that: large P_(CMAX,c) change, large Pchange, but non-MPR (e.g., SAR) has no effect on P_(CMAX,c). Reference2A-3 describes that: Trigger Not Useful, that Delta P_(CMAX,c) wouldcause trigger, that Delta P would cause trigger, and that Delta non-MPReffect would not cause trigger.

Referring to FIG. 2B, for representative triggering condition 200B atthe first time T0, M0 may dominate P0 and at the second time T1, M1 maydecrease relative to M0 and P1 may increase relative to P0. At time T1,P1 may dominate M1. The change in PCMAX,c may be small and the change inP may be large. The non-MPR (e.g., SAR related) backoff may have only asmall effect on PCMAX,c. The change in PCMAX,c based on the change inMPR backoff may be expected or near what is expected by the eNB 140. APHR trigger may not be useful and/or needed due to the change in non-MPRbackoff. References 2B-1, 2B-2, and 2B-3 indicate various descriptionsassociated with FIG. 2B. Reference 2B-1 describes that: Trigger due tochange in non-MPR (e.g., SAR) not useful and that Almost the same aswhat network expects based on MPR. Reference 2B-2 describes that: SmallP_(CMAX,c) change, large P change, but non-MPR (e.g., SAR) has verysmall effect on P_(CMAX,c). Reference 2B-3 describes that: Trigger NotUseful, that Delta P_(CMAX,c) would not cause trigger, that Delta Pwould cause trigger, and that Delta non-MPR effect would not causetrigger.

Referring to FIG. 2C, for representative triggering condition 200C atthe first time T0, M0 may dominate P0 and at the second time T1, M1 maydecrease relative to M0 and P1 may remain about the same level relativeto P0. At time T1, P1 may dominate M1. The change in P_(CMAX,c) may belarge and the change in P may be small. The non-MPR (e.g., SAR related)backoff may have an effect on P_(CMAX,c). Because non-MPR backoff has aneffect on P_(CMAX,c), the value of or change in P_(CMAX,c) may not beexpected or near what is expected by the eNB 140. A PHR trigger may beuseful and/or needed even though the non-MPR backoff remained about thesame. References 2C-1, 2C-2, and 2C-3 indicate various descriptionsassociated with FIG. 2C. Reference 2C-1 describes that: Trigger usefuleven though non-MPR (e.g., SAR) did not change and that P_(CMAX,c) maybe different from what network expects (network expects that M1 isused). Reference 2C-2 describes that: Large P_(CMAX,c) change, small Pchange, non-MPR (e.g., SAR) had no effect, but now has large effect onP_(CMAX,c). Reference 2C-3 describes that: Trigger Useful, that DeltaP_(CMAX,c) would cause trigger, that Delta P would not cause trigger,and that Delta non-MPR effect would cause trigger.

Referring to FIG. 2D, for representative triggering condition 200D, atthe first time T0, M0 may dominate P0 and at the second time T1, M1 maydecrease relative to M0 and P1 may increase relative to P0. At time T1,P1 may dominate M1. The change in P_(CMAX,c) may be small and the changein P may be large. The non-MPR (e.g., SAR related) backoff may now havea large effect on the P_(CMAX,c). Because non-MPR backoff now has aneffect on P_(CMAX),c, the value of or change in P_(CMAX,c) may not beexpected or near what is expected by the eNB 140. A PHR trigger may beuseful and/or needed due to the change in non-MPR backoff even thoughthe change in P_(CMAX,c) may be small. References 2D-1, 2D-2, and 2D-3indicate various descriptions associated with FIG. 2D. Reference 2D-1describes that: Trigger useful even though P_(CMAX,c) did not changemuch and that P_(CMAX,c) may be different from what network expects(network expects that M1 is used). Reference 2D-2 describes that: SmallP_(CMAX,c) change, large P change, non-MPR (e.g., SAR) had no effect,but now has large effect on P_(CMAX,c). Reference 2D-3 describes that:Trigger Useful, that Delta P_(CMAX,c) would not cause trigger, thatDelta P would cause trigger, and that Delta non-MPR effect would causetrigger.

Referring now to FIG. 3A, for representative triggering condition 300Aat a first time T0, P0 may dominate M0 and at a second time T1, M1 mayincrease relative to M0 and P1 may decrease relative to P0. At time T1,M1 may dominate P1. The change in P_(CMAX,c) and P may be small, but thenon-MPR (e.g., SAR related) backoff may have had a large effect onP_(CMAX),c but now has no effect on P_(CMAX),c. Because non-MPR backoffhad an effect on P_(CMAX,c), but no longer has an effect on P_(CMAX,c),the value of P_(CMAX,c) may not be expected or near what is expected bythe eNB 139. A PHR trigger may be useful and/or needed even thoughP_(CMAX,c) and P did not change significantly. References 3A-1, 3A-2,and 3A-3 indicate various descriptions associated with FIG. 3A.Reference 3A-1 describes that: Trigger useful even though P_(CMAX,c) andP did not change much and that P_(CMAX,c) may be different from whatnetwork expects (network expects MPR increase of M1−M0, but there isalmost no increase). Reference 3A-2 describes that: Small P_(CMAX,c)change, small P change, non-MPR (e.g., SAR) had large effect and now hasvery small effect on P_(CMAX,c). Reference 3A-3 describes that: TriggerUseful, that Delta P_(CMAX,c) would not cause trigger, that Delta Pwould not cause trigger, and that Delta non-MPR effect would causetrigger.

Referring to FIG. 3B, for representative triggering condition 300B atthe first time T0, P0 may dominate M0 and at the second time T1, M1 mayremain about the same relative to M0 and P1 may decrease relative to P0.At time T1, M1 may dominate P1. The change in P_(CMAX,c) and the changein P may be large. The non-MPR (e.g., SAR related) backoff may have hada large effect but may now have no effect on P_(CMAX,c). The value of orchange in P_(CMAX,c) may not be expected or near what is expected by theeNB 140. A PHR trigger may be useful and/or needed due to the change innon-MPR backoff. References 3B-1, 3B-2, and 3B-3 indicate variousdescriptions associated with FIG. 3B. Reference 3B-1 describes that:Trigger useful and that P_(CMAX,c) may be different from what networkexpects (Network expects MPR and P_(CMAX,c) to stay the same). Reference3B-2 describes that: Large P_(CMAX,c) change, large P change, non-MPR(e.g., SAR) had large effect, but now has no effect on P_(CMAX,c).Reference 3B-3 describes that: Trigger Useful, that Delta P_(CMAX,c)would cause trigger, that Delta P would cause trigger, and that Deltanon-MPR effect would cause trigger.

Referring to FIG. 3C, for representative triggering condition 300C atthe first time T0, P0 may dominate M0 and at the second time T1, M1 mayincrease relative to M0 and P1 may decrease relative to P0. At time T1,M1 may dominate P1. The change in P_(CMAX,c) may be small and the changein P may be large. The non-MPR (e.g., SAR related) backoff may have hadan effect on P_(CMAX,c) at time T0 but not at time T1. The value ofP_(CMAX,c) may not be expected or near what is expected by the eNB 140.A PHR trigger may be useful and/or needed due to the change in non-MPRbackoff even though P_(CMAX,c) has not changed significantly. References3C-1, 3C-2, and 3C-3 indicate various descriptions associated with FIG.3C. Reference 3C-1 describes that: Trigger useful and that P_(CMAX,c)may be different from what network expects (Network expects MPR increaseof M1−M0). Reference 3C-2 describes that: Small P_(CMAX,c) change, largeP change, non-MPR (e.g., SAR) had large effect, but now has no effect onP_(CMAX,c). Reference 3C-3 describes that: Trigger Useful, that DeltaP_(CMAX,c) would not cause trigger, that Delta P would cause trigger,and that Delta non-MPR effect would cause trigger.

Referring to FIG. 4A, for representative triggering condition 400A atthe first time T0, P0 may dominate M0 and at the second time T1, M1 mayincrease relative to M0 and P1 may increase relative to P0 where the P1increase may be similar to the M1 increase. At time T1, P1 may dominateM1. The change in P_(CMAX,c) may be large and the change in P may belarge, but since the non-MPR backoff change is similar to the MPRbackoff change, the corresponding change in P_(CMAX,c) may be expectedor near what is expected by the eNB 140. A PHR trigger may not be usefuland/or needed due to the change in non-MPR backoff. References 4A-1,4A-2, and 4A-3 indicate various descriptions associated with FIG. 4A.Reference 4A-1 describes that: Trigger do to change in non-MPR (e.g.,SAR) not useful and that Same as what network expects based on MPR.Reference 4A-2 describes that: Large P_(CMAX,c) change, large P change,but non-MPR (e.g., SAR) effect on P_(CMAX,c) is the same. Reference 4A-3describes that: Trigger Not Useful, that Delta P_(CMAX,c) would causetrigger, that Delta P would cause trigger, and that Delta non-MPR effectwould not cause trigger.

Referring to FIG. 4B, for representative triggering condition 400B atthe first time T0, P0 may dominate M0 and at the second time T1, M1 mayincrease relative to M0 and P1 may increase relative to P0. At time T1,P1 may dominate M1. The change in P_(CMAX,c) may be small and the changein P may be small. The non-MPR (e.g., SAR related) backoff may have amuch smaller effect on P_(CMAX),c at T1 versus T0. The value ofP_(CMAX,c) may not be expected or near what is expected by the eNB 140.A PHR trigger may be useful and/or needed due to the reduced effect ofnon-MPR backoff on P_(CMAX,c). References 4B-1, 4B-2, and 4B-3 indicatevarious descriptions associated with FIG. 4B. Reference 4B-1 describesthat: Trigger useful even though P_(CMAX,c) and P did not change muchand that P_(CMAX,c) may be different from what the network expects(network expects MPR increase of M1−M0, but there is almost noincrease). Reference 4A-2 describes that: Small P_(CMAX,c) change, smallP change, but non-MPR (e.g., SAR) effect on P_(CMAX,c) got much smaller.Reference 4A-3 describes that: Trigger Useful, that Delta P_(CMAX,c)would not cause trigger, that Delta P would not cause trigger, and thatDelta non-MPR effect would cause trigger.

In certain representative embodiments, the logic associated with FIGS.2A-2D, 3A-3C, and 4A-4B may include:

If M0>P0 and M1<P1, WTRU may trigger PHR if P1−M1>a threshold;

If M0<P0 and M1>P1, WTRU may trigger PHR if P0−M0>a threshold; and

If M0<P0 and M1<P1, WTRU may trigger PHR if |(P1−M1)−(P0−M0)|>athreshold.

M0 and P0 may represent the MPR backoff and the non-MPR backoff,respectively, when the last PHR was sent by the WTRU 102. M1 and P1 mayrepresent MPR backoff and non-MPR backoff, respectively, sometime laterto determine whether to trigger PHR. Another representative logic maytrigger PHR when |[MAX(P1,M1)−M1]−[MAX(P0,M0)−M0]|>a threshold.

The above is summarized in Table 1 below where 1^(st) term isMAX(P1,M1)−M1 and 2^(nd) term is MAX(P0,M0)−M0.

TABLE 1 1^(st) term 2^(nd) term |1^(st) term − 2^(nd) term| Trigger Case1: 0 0 0 No M0 > P0, M1 > P1 Case 2: P1 − M1 0 P1 − M1 if |1^(st) term −2^(nd) term| > threshold M0 > P0, M1 < P1 Case 3: 0 P0 − M0 |−P0 + M0| =P0 − M0 if |1^(st) term − 2^(nd) term| > threshold M0 < P0, M1 > P1 Case4: P1 − M1 P0 − M0 (P1 − M1) − (P0 − M0) if |1^(st) term − 2^(nd)term| > threshold M0 < P0, M1 < P1

The trigger may be on a CC basis such that the PHR may be triggered ifany threshold is exceeded for any CC. The trigger may be on a WTRUbasis. There may be MPR and non-MPR backoff defined for the WTRU 102 asa whole. In certain representative embodiments, these values may be usedto determine whether to trigger PHR in lieu of using the CC specific MPRbackoff and non-MPR backoff.

In certain representative embodiments, upon sending a PHR, the WTRU maycompute and/or may store P0=PMPRactual and M0=MPRactual (which mayinclude MPR and A-MPR). Each TTI (or each TTI for which the WTRU an ULgrant), the WTRU may compute P1=PMPRactual and M1=MPRactual. If|[MAX(P1,M1)−M1]−[MAX(P0,M0)−M0]|>a threshold, the WTRU may trigger aPHR.

The PHR may be triggered if the threshold is crossed for any CC. In thiscase, subscripts of c may be added to all the variable names. In certainrepresentative embodiments, the impact may be computed for the WTRU 102as a whole such that CC subscripts may be removed and a trigger may bebased on the WTRU specific determination of a threshold being crossed.

Eliminating Triggers (e.g., Unnecessary or not Useful Triggers) whichMay be Caused by Virtual PHR

A PHR may be triggered and may be sent by the WTRU 102 to the eNB 140for various reasons. The PHR may include one or more PH values and otherparameters providing additional information.

For example, when a PHR is sent by the WTRU 102 in a particular TTI, thePHR may include a real PH for each active CC that has a UL grant (e.g.,actual resources assigned) in that TTI and a virtual PH for any activeCC that does not have a UL grant in that TTI. A real PH may be computedusing the parameters associated with the grant and any power reductionstaken by the WTRU 102 to enable it to meet (e.g., satisfy) transmissionlimits or requirements such as spurious emission mask (SEM) and/or SAR,among others. A virtual PH may use a reference grant and/or may use zerofor one or more of the power reductions. The WTRU 102 may include theconfigured maximum output power for each CC, P_(CMAX),c in the report,and P_(CMAX,c) for a CC reporting virtual PH may be omitted.

The PHR may be triggered when the additional power backoff due to powermanagement (e.g., P-MPR) for at least one activated Serving Cell changesby more than a threshold. The trigger may be defined to occur when aprohibitPHR-Timer expires or has expired and the additional powerbackoff due to power management (as allowed by P-MPR) for at least oneactivated Serving Cell with configured uplink has changed more thandl-PathlossChange dB since the last transmission of a PHR when WTRU 102has UL resources for new transmission.

It is contemplated that when the last PHR was sent, it may have includeda virtual PH for one or more of the serving cells (also referred to asCCs). In this case, for the virtual PH included in the last PHR, theadditional power backoff allowed by P-MPR may be set to zero. Whencomparing the current additional power backoff to the additional powerbackoff used when the last PH was sent, the comparison may be made witha value of zero for the virtual PH. As long as the additional powerbackoff exceeds (e.g., itself exceeds) the threshold for triggering,there may be a trigger. Due to the comparison with zero for the virtualPH, the trigger may be based on a perceived change in additional powerbackoff which is not a real change. This may result in excessiveunnecessary or not useful triggers whenever the scheduler chooses not toschedule a particular CC. A similar scenario may occur when the last PHRincluded a real PH for a given CC, with an actual additional backoffvalue, and in the current TTI in which the additional power backoffcomparison may be made to determine whether to trigger the PHR, the CCdoes not have an UL grant and the additional backoff for the CC may beset to zero. The value of the real additional power backoff (e.g., if itis greater than the threshold) may be the source of a PHR triggerinstead of a real change in the additional power backoff, which mayagain potentially cause excessive unnecessary or not useful triggers.

It is contemplated that in a given TTI, sending the PHR when the powermanagement backoff changes may provide the eNB 140 with a PHR thatincludes the updated power management backoff so it may include thepower management backoff in scheduling decisions. Sending a PHR based onthis trigger may therefore only be useful for a CC if the actual powermanagement backoff has changed in magnitude greater than a thresholdamount and/or if the PH and/or any applicable associated parametersreported, for example P_(CMAX,c), account for the actual powermanagement backoff.

It is contemplated that one of the parameters used in the PHR is a V bitwhich may indicate if the PH value is based on a real transmission or areference format. For Type 1 PH, V=0 may indicate a real transmission onthe PUSCH and V=1 may indicate that a PUSCH reference format is used.For Type 2 PH, V=0 may indicate real transmission on the PUCCH and V=1may indicate that a PUCCH reference format is used. For both Type 1 andType 2 PH, V=0 may indicate the presence of the associated P_(CMAX),cfield, and V=1 may indicate that the associated P_(CMAX),c field isomitted.

Certain Representative PHR Triggering Procedures

To eliminate excessive and/or unnecessary (or not useful) triggers dueto comparisons based on virtual headroom reports, among other reasons,the WTRU 102 may trigger PHR when the the power backoff (e.g., used forpower management) for a given CC when compared with the power backoff(e.g., used for power management) for the given CC the last time theWTRU 102 sent a real PHR for the given CC changes by more than athreshold.

The WTRU 102 may use the last time the WTRU 102 transmitted a P_(CMAX),cvalue in the PHR for a given CC to determine the last time it sent areal PHR for the given CC.

The WTRU 102 may use the last time the WTRU 102 included an indicationin the PHR for a given CC indicating it is a non-virtual CC (e.g., thelast time the WTRU 102 included in a PHR a Vbit for the given CC thatwas set to 0) to determine the last time it sent a real PHR for thegiven CC.

For a PCell, which has 2 types of headroom reports (e.g., Type 1 for thePUSCH headroom report and Type 2 for the PUSCH+PUCCH headroom report),the WTRU 102 may use either the Type 1 PH, the Type 2 PH or both theType 1 and Type 2 PHs when determining whether the trigger criteria issatisfied for the PCell (primary serving cell or CC). For example, theWTRU 102 may determine that a real PHR has been sent for this CC if oneor more of the Type 1 and/or Type 2 PHs were real when the PHR was sent.For example if Vbit was not equal to 1 (e.g., virtual) for both PH typesthe PHR may be considered to be real. As a second example, if at leastone of the Type 1 and Type 2 P_(CMAX),c values was sent in the PHR forthe PCell the PHR may be considered to be real. In certainrepresentative embodiments, the WTRU 102 may use one of the Type 1 PH orthe Type 2 PH to determine whether the trigger criteria is satisfied.

The WTRU 102 may ignore any deactivations of an SCell (secondary servingcell) when determining the last real PHR for the SCell. For example ifsince the last real PHR for a given CC, the CC was deactivated andreactivated one or more times, the WTRU 102 may still use the last realPHR for that CC. In certain representative embodiments, the WTRU 102 mayconsider (e.g., only consider) PHR transmissions since the lastactivation or reactivation of the CC. If there was no real PHR for theCC since the last activation or reactivation, the WTRU 102 may delayevaluation of the triggering criteria to determine whether to triggerthe PHR until there is a real PHR for this CC after the activation orreactivation, or the WTRU 102 may handle it as a special case and maytrigger based on other criteria such as the value of the powermanagement backoff (or the impact of the power management backoff onP_(CMAX,c)) greater than a threshold.

When a SCell is configured or reconfigured, the WTRU 102 may consider(e.g., only consider) the PHR transmissions for the SCell since theconfiguration or reconfiguration. If there was no real PHR for this CCsince the last configuration or reconfiguration, the WTRU 102 may delayevaluation of the triggering criteria to determine whether to triggerPHR until there is a real PHR for this CC after the configuration orreconfiguration, or the WTRU 102 may handle this as a special case andtrigger based on other criteria such as the value of the powermanagement backoff (or the impact of the power management backoff onP_(CMAX,c)) greater than a threshold.

In certain representative embodiments, as an alternative to or in lieuof triggering based on a change in the additional power backoffexceeding a threshold, the trigger may be based on a change in theimpact of the additional power backoff on P_(CMAX,c) exceeding athreshold.

In certain representative embodiments, triggering the PHR based onchanges related to additional power backoff (e.g., actual change orchange in impact) may be gated by the prohibit timer in a similar manneras other PHR triggers.

In certain representative embodiments, triggering the PHR based onchanges related to the additional power backoff may be applicable to(e.g., only to) active CCs with configured UL.

In certain representative embodiments, triggering the PHR based onchanges related to additional power backoff may be applicable in (e.g.only in) TTIs in which the WTRU 102 has UL resources for newtransmission for any CC.

To eliminate excessive and unnecessary or not useful triggers due tocomparisons based on virtual headroom reports, and/or to ensuremeaningful reports are sent by the WTRU 102, among other reasons,comparisons (e.g., of power management backoff values or impacts ofpower management backoff values) and triggering of the PHR based onchanges related to power management backoff may be applicable for agiven CC in (e.g., only in) TTIs in which the WTRU 102 has UL resources(e.g., which may be PUSCH and/or PUCCH resources) for that CC. Forexample, the WTRU 102 may evaluate (or consider) the triggeringcondition for a given CC in (e.g., only in) TTIs in which the WTRU 102has a valid UL grant (or UL resources assigned) for the given CC, and/ormay evaluate (or consider) the triggering condition for a given CC in(e.g., only in) TTIs in which the WTRU 102 has valid UL resources for anew transmission for the CC (or any CC).

Representative Examples of how to Define the Triggering Criteria (e.g.,Equivalent Definitions Using Different Wording May Also be Used)

A prohibitPHR-Timer expires or has expired or may expire or may haveexpired and the additional power backoff due to power management (e.g.,P-MPR or as allowed by P-MPR) for at least one activated Serving Cellwith UL resources has changed or may have changed by more than athreshold (for example dl-PathlossChange dB), since the lasttransmission of a PHR when there were UL resources for this servingcell, when the WTRU 102 has or may have UL resources for newtransmission.

A prohibitPHR-Timer expires or has expired or may expire or may haveexpired and the additional power backoff due to power management (e.g.,P-MPR or as allowed by P-MPR) for at least one activated Serving Cellwith a valid UL grant has changed or may have changed by more than athreshold (for example dl-PathlossChange dB), since the lasttransmission of a PHR when there was a valid UL grant for this servingcell, when the WTRU 102 has or may have UL resources for newtransmission.

A prohibitPHR-Timer expires or has expired or may expire or may haveexpired and the additional power backoff due to power management (e.g.,P-MPR or as allowed by P-MPR) for at least one activated Serving Cellwith a valid UL grant has changed or may have changed by more than athreshold (for example dl-PathlossChange dB), since the lasttransmission of a real PHR for this serving cell when the WTRU 102 hasor may have UL resources for new transmission.

A prohibitPHR-Timer expires or has expired or may expire or may haveexpired and the additional power backoff due to power management (e.g.,P-MPR or as allowed by P-MPR) for at least one activated Serving Cellwith a valid UL grant has changed or may have by changed by more than athreshold (for example dl-PathlossChange dB), since the lasttransmission of a PHR with Vbit=0 for this serving cell, when the WTRU102 has or may have UL resources for new transmission.

A prohibitPHR-Timer expires or has expired or may expire or may haveexpired and the additional power backoff due to power management (e.g.,P-MPR or as allowed by P-MPR) for at least one activated Serving Cellwith a valid UL grant has changed or may have changed by more than athreshold (for example dl-PathlossChange dB), since the lasttransmission of a PHR with any Vbit=0 for this serving cell, when theWTRU 102 has or may have UL resources for new transmission.

A prohibitPHR-Timer expires or has expired or may expire or may haveexpired and the additional power backoff due to power management (e.g.,P-MPR or as allowed by P-MPR) for at least one activated Serving Cellwith a valid UL grant has changed or may have changed by more than athreshold (for example dl-PathlossChange dB), since the lasttransmission of a Type 1 PHR with the Vbit=0 for this serving cell, whenthe WTRU 102 has or may have UL resources for new transmission.

A prohibitPHR-Timer expires or has expired or may expire or may haveexpired and the additional power backoff due to power management (e.g.,P-MPR or as allowed by P-MPR) for at least one activated Serving Cellwith a valid UL grant has changed or may have changed by more than athreshold (for example dl-PathlossChange dB), since the lasttransmission of a real Type 1 PHR for this serving cell, when WTRU 102has or may have UL resources for new transmission.

It is contemplated that “Serving Cell with a valid UL grant (or ULresources)” may be the same as “Serving Cell with configured uplink anda valid grant (or UL resources).” For all of the examples above, “theadditional power backoff due to power management (e.g., P-MPR or asallowed by P-MPR) for at least one activated Serving Cell” may bereplaced by “the effect (or impact) of additional power backoff due topower management (e.g., P-MPR or as allowed by P-MPR) on P_(CMAX,c) forat least one activated Serving Cell,” or by “the effect of additionalpower backoff due to power management (e.g., P-MPR or as allowed byP-MPR) on the configured maximum output power for at least one activatedServing Cell,” or by “the effect (or impact) on P_(CMAX,c) of powerbackoff due to power management (e.g., P-MPR or as allowed by P-MPR) forat least one activated Serving Cell” or by their equivalent.

It is contemplated to ensure that there is a real PHR for comparison foreach CC following one or more of: configuration, reconfiguration,activation, and/or reactivation.

For any condition or event for or after which it may be useful totrigger a first real PHR (e.g., after the occurrence of the condition orevent), the WTRU 102 may trigger the PHR for an active CC that has avalid UL grant (or UL resources) if the power management backoff itselfexceeds a threshold, or the impact of the power management backoff onthe P_(CMAX,c) exceeds a threshold.

Representative triggering procedures may include a requirement orpolicies that a PHR be triggered based on any of the criteria describedherein, for example for eliminating triggers (e.g., unnecessary or notuseful triggers) which may be caused by virtual PHR, for example basedon one of (1) the power backoff due to power management (e.g., P-MPR oras allowed by P-MPR) for at least one activated Serving Cell withconfigured uplink and a valid grant (or UL resources) has changed morethan a threshold; (2) the effect (or impact) on P_(CMAX,c) of powerbackoff due to power management (e.g., P-MPR or as allowed by P-MPR) forat least one activated Serving Cell with configured uplink and a validgrant (or UL resources) has changed more than a threshold; (3) theeffect (or impact) of power backoff due to power management (e.g., P-MPRor as allowed by P-MPR) on P_(CMAX,c) for at least one activated ServingCell with configured uplink and a valid grant (or UL resources) haschanged more than a threshold; among others, where the reference pointfor comparison to determine whether the change is more than a thresholdmay be a previous (e.g., most recent) time, time period, or intervalwhen a PHR was transmitted and one of (1) the at least one activatedServing Cell with configured uplink had a valid grant (or UL resources);(2) the PHR included a real PH for the at least one activated ServingCell with configured uplink; among others.

The threshold may be the dl-PathlossChange which may be in dB.

A representative power headroom reporting procedure may be used toprovide the serving eNB 140 with information about the differencebetween the nominal WTRU maximum transmit power and the estimated powerfor the UL-SCH transmission per activated Serving Cell and withinformation about the difference between the nominal WTRU maximum powerand the estimated power for the UL-SCH and the PUCCH transmission on thePCell. The RRC may control Power Headroom reporting by configuring thetwo timers periodicPHR-Timer and prohibitPHR-Timer, and by signalling adl-PathlossChange which may set the change in a measured downlinkpathloss to trigger a PHR.

A Power Headroom Report (PHR) may be triggered if any of the followingevents occur:

-   -   prohibitPHR-Timer expires or has expired and the path loss has        changed more than dl-PathlossChange dB for at least one        activated Serving Cell which is or may be used as a pathloss        reference since the last transmission of a PHR when the WTRU 102        has or may have UL resources for new transmission:    -   periodicPHR-Timer expires;        -   upon configuration or reconfiguration of the power headroom            reporting functionality by upper layers, which is not used            to disable the function;        -   activation of an SCell with configured uplink; and/or        -   a triggering criteria related to change in additional power            backoff or change in the effect of additional power backoff            such as any described herein, for example: the            prohibitPHR-Timer expires or has expired and the effect on            P_(CMAX,c) of power backoff due to power management (as            allowed by P-MPR) for at least one activated Serving Cell            with configured uplink and a valid grant has or may have            changed more than dl-PathlossChange dB since the last            transmission of a PHR when the WTRU 102 has or may have UL            resources for new transmission.

If the WTRU 102 has UL resources allocated for the new transmission forthis TTI:

-   -   if it is the first UL resource allocated for a new transmission        since the last MAC reset, start periodicPHR-Timer;    -   if the Power Headroom reporting procedure determines that at        least one PHR has been triggered since the last transmission of        a PHR or this is the first time that a PHR is triggered, and;    -   if the allocated UL resources can or may accommodate a PHR MAC        control element plus its subheader as a result of logical        channel prioritization:        -   if extendedPHR is configured:            -   for each activated Serving Cell with configured uplink:                -   obtain the value of the Type 1 power headroom and in                    certain cases the corresponding P_(CMAX,c)                    associated with this Serving Cell from the physical                    layer;            -   if simultaneous PUCCH-PUSCH is configured:                -   obtain the value of the Type 2 power headroom for                    the PCell and in certain cases the corresponding                    P_(CMAX,c) from the physical layer;            -   instruct the Multiplexing and Assembly procedure to                generate and transmit an Extended PHR MAC control                element based on the values reported by the physical                layer;        -   else:        -   obtain the value of the Type 1 power headroom from the            physical layer;            -   instruct the Multiplexing and Assembly procedure to                generate and transmit a PHR MAC control element based on                the value reported by the physical layer;        -   start or restart periodicPHR-Timer;        -   start or restart prohibitPHR-Timer;        -   cancel all triggered PHR(s).

In certain representative embodiments, procedures may be implementedthat establish when to apply additional backoff to the P_(CMAX,c) foruse in the power control and the PHR.

Due to SAR or other, for example non-LTE, effects, the P_(CMAX,c) may bereduced, or backed off, for transmit power determination and/or powerheadroom calculations.

When the amount of additional backoff needs or is to be changed, theWTRU 102 may begin to use or apply the changed backoff to change thevalue of P_(CMAX,c) used to determine channel power, for example, theP_(PUSCH,c)(i), in one of the following options (e.g., ways): (1)applied immediately upon changed condition, regardless of time of theeventual PHR; (2) waiting until the changed P_(CMAX,c) has been reportedby the WTRU 102 in a PHR before applying; (3) waiting no longer than athreshold amount of time before applying; and/or (4) applyingimmediately, or within a given amount of time, if the next periodic PHRmay occur beyond a given amount of time. It is contemplated that some orall of the options may be combined such as items 2 and 3, for example.For example, the WTRU 102 may wait until the threshold amount of timepasses or until it reports P_(CMAX,c) in a PHR, whichever may comefirst, before applying.

Which of the four options (e.g., ways) to use may be dependent onwhether the amount of additional backoff to use increases or decreases.In certain representative embodiments, it may be related to the effectof the additional backoff on P_(CMAX,c) as opposed to the absolutechange in the additional backoff.

For example, if the situation occurs that the amount of additionalbackoff or the impact of additional backoff on P_(CMAX,c) increases(which may potentially result in a decrease in transmit power), waitingto apply the backoff change may result in undesirable radio frequency(RF) effects towards a mammal, for example, a human. In this case, itmay be best to apply the change to the backoff immediately, regardlessof when PHR may be sent. It may be useful to send the PHR (e.g., withthe changed P_(CMAX,c)) as soon as possible after applying the change.Until the PHR is sent, the eNB 140 may assign UL grants that the WTRU102 may not support.

If the situation occurs that the amount of additional backoff or theimpact of additional backoff on the P_(CMAX,c) decreases (which maypotentially result in the ability to increase transmit power), waitingto apply the backoff change may delay the ability of the WTRU 102 tohandle larger grants, which the eNB 140 may send once it becomes awareof the decreased backoff via PHR. In this case, the delay in sending aPHR may be more acceptable.

One or more of the following representative procedures may apply.

(1) If the additional backoff (or the additional backoff effect)decreases, the WTRU 102 may apply the changed backoff immediately orwithin a given timeframe or, alternatively, the WTRU 102 may wait untila PHR is sent to apply the backoff. In certain representativeembodiments, if a PHR is not sent for some predetermined time, the WTRU102 may apply a changed backoff and may not wait any longer for a PHR.In other representative embodiments, the WTRU 102 may apply a backoffwithin a given amount of time if a next periodic PHR may occur beyond agiven amount of time.

(2) If the additional backoff (or the additional backoff effect)increases, the WTRU 102 may apply the changed backoff immediately orwithin a given timeframe. In certain representative embodiments, theWTRU 102 may wait until a PHR is sent to apply the backoff. In otherrepresentative embodiments, if a PHR is not sent for some predeterminedtime, the WTRU 102 may apply a changed backoff and may not wait anylonger for a PHR. In yet other representative embodiments, the WTRU 102may apply a backoff within a given amount of time if the next periodicPHR may occur beyond a given amount of time.

It is contemplated that even if a PHR is triggered due to additionalbackoff (e.g., a changing requirement for additional backoff),transmission of the PHR may be delayed (e.g., because there may not bespace (e.g., capacity) for the MAC CE). There may be a non-zero timeperiod between when the requirement for changed additional backoffoccurs and the sending of the PHR.

In certain representative embodiments, representative procedures forhandling rapidly changing additional backoff may be implemented.

Previous sections describe, for example, triggering of a PHR based onchanges to additional backoff or changes to impacts of additionalbackoff. Representative procedures may handle rapid changes toadditional backoff. Such representative procedures may also be appliedin the case of non-rapidly changing additional backoff.

As an example, a 1xEV-DO transmission may be very bursty (e.g., down to2.5 ms ON and up to 17.5 ms OFF in a 20 msec frame), although it mayalso be continuously ON. There may be problems associated with reportinga PHR at the start and end of each such high-rate burst. If PHRstriggered by changes in additional backoff or changes in impacts ofadditional backoff were subject to a prohibit timer (e.g., a timer usedto prohibit a PHR from being triggered for a time period after the lastPHR was sent), the PHR triggers at the start and end of such high-ratebursts may become lost, for example, as the toggling rate may be fasterthan the prohibit timer period. If the PHRs triggered by these changesare not subject to a prohibit timer, there may be excessive signalingoverhead of the PHR.

Representative procedures for handling rapidly changing additionalbackoff are described in the following. Representative procedure 1 maykeep the backoff stable at a level consistent with the ON state as longas the ON state is possible. For example, if 1X or another air interfaceoperation is enabled or if a 1X or other call is connected or inprogress, the backoff for the ON state may be used regardless of whetherthere are bursts or not.

Representative procedure 2 for 1X may be that the WTRU 102 may detect oraccept an indication that it is either in or not in a mode of sendingfast 1X bursts (which may be referred to as burst mode), and that whilein the mode of sending fast 1X bursts, P_(CMAX,c) in PHR may be signaledas if the 1X transmissions were continuously ON. This representativeprocedure may be used to: (1) trigger a PHR including a reducedP_(CMAX,c), (e.g., due to increased backoff), when fast bursts begin(e.g., first begin); (2) include in a (e.g., any) PHR triggered foranother reason (e.g., periodic or significantly changed pathloss), whilein the mode of sending fast 1X bursts, the P_(CMAX,c) as if increasedbackoff is used, regardless of the actual backoff (e.g., backoff needed)at the time of the PHR; and/or (3) trigger a PHR including increasedP_(CMAX,c), (due to no longer using the increased backoff), when bursts(e.g., all such bursts) have ended.

An example algorithm to determine the 1X burst mode and trigger a PHR atthe start and end of burst mode may include:

in every subframe, observe if 1X is either transmitting or nottransmitting if 1X is transmitting  burst mode=ON  if 1X was nottransmitting in the previous subframe    note the time (denoted as“burst-ON start time”)  If burst mode in previous subframe was OFF,   trigger PHR, to report reduced P_(CMAX,c) if 1X is not transmitting if burst mode in previous subframe was ON   if time since burst-ONstart time is more than 20 ms ago     burst mode=OFF     Trigger PHR, toreport increased P_(CMAX,c)

Representative procedure 3, for example, may handle a rapidly changingadditional backoff requirement, such as due to SAR. The WTRU 102 maydetermine when any additional backoff is needed (or to be used), such aswhen proximity is detected, and may keep the level of additional backoffconsistent (e.g., at the worst case or at another amount) untiladditional backoff is not needed (or not used) for some length of time.

Representative procedure 4, for example, may include reporting in thePHR, P_(CMAX,c) including the worst case additional backoff oradditional backoff impact that occurred in the period since the lastPHR. For example:

Time 0 (last PHR report): Backoff=b0;

Time 1 (next subframe): Backoff=b1;

Time 2 (next subframe): Backoff=b2; . . .

Time p (subframe in which next PHR may be sent): Backoff=bp; and

P_(CMAX,c) may be reported by the WTRU using backoff=Max (b0, b1, b2, .. . , bp).

Although 1xEV-DO and SAR are shown as examples, it is contemplated thatthe representative procedures may be used for any bursty or non-burstyapplication and/or any rapidly or non-rapidly changing backoffsituation.

In certain representative embodiments, representative procedures forhandling virtual PHR when there is additional backoff may beimplemented.

There may be various representative procedures for handling thereporting of P_(CMAX,c) for a virtual PHR. The representative proceduresmay include: (1) always reporting P_(CMAX,c) for both non-virtual PHRand virtual PHR; or (2) reporting P_(CMAX,c) for non-virtual PHR but notfor virtual PHR since for virtual PHR, MPR, A-MPR, and ΔT_(C) may bezero such that the eNB 140 may determine P_(CMAX,c) for virtual PHRswithout it being reported. These representative procedures may be basedon the allowed power reductions of MPR, A-MPR, and ΔT_(C.)

Representative procedures may be implemented for handling virtual PHRand P_(CMAX,c) when implementing additional backoff. For a virtual PHR,the WTRU 102 may include the effect of additional backoff (e.g.,associated with SAR and/or 1X effects) in the determination ofP_(CMAX,c). In certain representative embodiments, if the WTRU 102includes the effect of additional backoff in P_(CMAX,c), the WTRU 102may report P_(CMAX,c) for virtual PHRs when (e.g., only when) P_(CMAX,c)is affected by the additional backoff. In other representativeembodiments, for virtual PHR, the WTRU 102 may exclude the effect ofadditional backoff (e.g., associated with SAR and/or 1X) from thedetermination of P_(CMAX,c) and P_(CMAX,c) may not be reported invirtual PHR.

It is contemplated that if the WTRU 102 reports (e.g., always reports)P_(CMAX,c) in the PHR, the P_(CMAX,c) may be reported for virtual PHRregardless of the type of backoff that is or is not included in theP_(CMAX,c).

Representative procedures may be implemented for addressing maximumpower per WTRU and maximum power per CC.

A maximum power range may be defined for the WTRU 102 at a CC level andat a WTRU level. By extension of the equations already defined herein,an example per CC configured maximum output power, P_(CMAX,c), may bedefined as set forth in Equation 14 and the WTRU 102 may be allowed toset its configured maximum output power per CC within the bounds setforth in that equation.

P _(CMAX) _(—) _(L,c) ≦P _(CMAX,c) ≦P _(CMAX) _(—) _(H,c)  Equation (14)

where:

P_(CMAX) _(—) _(L,c)=MIN{P_(EMAX,c)−ΔT_(C),P_(PowerClass)−MAX(MPR+A-MPR, P-MPR)−ΔT_(C)}

P_(CMAX) _(—) _(H,c)=MIN{P_(EMAX,c), P_(PowerClass)}

P_(EMAX,c) may be a maximum power limit signaled by higher layers (forthe CC), for example, signalled to the WTRU by the eNB 140 in the P-MaxIE.

An MPR, an A-MPR, a ΔT_(C), and a P-MPR may each be defined as havingone common value for the WTRU 102 and for all CCs. For example, an MPRmay be the same for all CCs and for the WTRU 102 as an entirety. Use ofthe same value for each CC and for the WTRU may be possible due to thepowers of the CCs being summed. For example, a reduction of 3 dB for theWTRU 102 may be accomplished by applying a 3 dB reduction to eachindividual CC.

In certain representative embodiments, CC specific values may be definedfor one or more of the values for one or more of the CCs. For any CCspecific value, the CC specific value may be used in the equation andmay be represented by adding a subscript c to the value, for example,MPR_(c), A-MPR_(c), P-MPR_(c), and ΔT_(Cc.)

Instead of, or in addition to, the per CC configured maximum outputpower, P_(CMAX,c), an overall WTRU configured maximum output power,P_(CMAX), may be defined, for example as previously described herein,and the WTRU 102 may be allowed to set its configured maximum outputpower within the following bounds:

P _(CMAX) _(—) _(L) ≦P _(CMAX) ≦P _(CMAX) _(—) _(H)  Equation (15)

where, using as an example the lower limit P_(CMAX) _(—) _(L) fromEquation 3 and referring to the nonMPR power reduction value as P-MPR,P_(CMAX) _(—) _(L) is as set forth in Equation 16:

P _(CMAX) _(—) _(L)=MIN{P _(EMAX) −ΔT _(C) ,P_(PowerClass)−MAX(MPR+A-MPR,P-MPR)−ΔT _(C)}  Equation (16)

and where, the upper limit P_(CMAX) _(—) _(H) may be defined as:

P _(CMAX) _(—) _(H)=MIN{P _(EMAX) ,P _(PowerClass)}  Equation (17)

where P_(EMAX) may be a power limit signaled by the eNB via higherlayers, for example the RRC, or it may be a value computed, for exampleby the WTRU, from the individual signaled power limits for each CC,P_(EMAX,c).

As an example, P_(EMAX)=10 log₁₀ Σp_(EMAX,c), where P_(EMAX,c) may bethe RRC signalled power limit in the P-Max IE for each CC. P_(EMAX,c)may be a value expressed in dB and p_(EMAX,c) may be the value ofP_(EMAX,c) expressed in linear notation.

It is contemplated that the P_(CMAX) value may be used as a limit for adecision to scale channel powers and/or as a limit not to be exceeded inthe power control procedure.

In certain representative embodiments the P_(CMAX) and/or the P_(CMAX,c)may be determined for subframe i and may be denoted as P_(CMAX)(i) andP_(CMAX,c)(i), respectively.

In another example, the lower limit P_(CMAX) _(—) _(L) may be defined,determined and/or computed from per-CC values.

The lower limit of the P_(CMAX) may be defined, determined and/orcomputed from per-CC values as follows:

P _(CMAX) _(—) _(L,c)=MIN{P _(EMAX,c) −ΔT _(C,c) ,P_(PowerClass)−MAX(MPR_(c)+A-MPR_(c),P-MPR_(c))−ΔT _(C,c)}  Equation (18)

where the subscript of c indicates a CC specific value. The CC valuesmay be the same or different. For example, for intra-band CCs, for oneor more of the MPR, the A-MPR, the P-MPR, and/or the ΔT_(C),WTRU-specific values or band specific values may be provided and thosevalues may be used for the individual CC values.

Using linear notation, where lowercase (for example for at least thefirst character of a value) may indicate linear values, Equation 18 maybe expressed as set forth in Equation 19:

10 log₁₀ p _(CMAX) _(—) _(L,c)=MIN{10 log₁₀(p _(EMAX,c)/(Δt _(C,c)),10log₁₀ p _(PowerClass)/(mpr_(c)·a-mpr_(c) ·Δt _(C,c)),10 log₁₀ p_(PowerClass)/(pmpr_(c) ·Δt _(C,c))},  Equation (19)

hence: p _(CMAX) _(—) L,c=MIN{p _(EMAX,c)/(Δt _(C,c)),p_(PowerClass)/(mpr_(c)·a-mpr_(c) ·Δt _(C,c)),p _(PowerClass)/(pmpr_(c)·Δt _(C,c))}.  Equation (20)

The lowest value that the sum of the powers of multiple CCs is:

Σp _(CMAX) _(—) _(L,c)=ΣMIN{p _(EMAX,c)/(Δt _(C,c)),p_(PowerClass)/(mpr_(c)·a-mpr_(c) ·Δt _(C,c)),p _(PowerClass)/(pmpr_(c)·Δt _(C,c))}  Equation (21)

Thus:

P _(CMAX) _(—) _(L)=10 log₁₀ Σp _(CMAX) _(—) L,c=10 log₁₀ ΣMIN{p_(EMAX,c)/(Δt _(C,c)),p _(PowerClass)/(mpr_(c)·a-mpr_(c) ·Δt _(C,c)),p_(PowerClass)/(pmpr_(c) ·t _(C,c))}  Equation (22)

The lower limit for P_(CMAX) as set forth in Equation 22 may be appliedto (or for) intra-band band CCs and/or inter-band CCs. It iscontemplated that for low power reductions (for example MPR and others),this may result in a P_(CMAX) _(—) _(L) value that is larger than thePowerClass (for example a value close to the number ofCCs×p_(PowerClass)). It may therefore be useful to ensure the value doesnot exceed P_(PowerClass). The lower limit for P_(CMAX) as set forth inEquation 22 may be modified as set forth in Equation 23:

P _(CMAX) _(—) _(L)=MIN{10 log₁₀ ΣMIN[p _(EMAX,c)/(Δt _(C,c)),p_(PowerClass)/(mpr_(c)·a-mpr_(c) ·Δt _(C,c)),p _(PowerClass)/(pmpr_(c)·Δt _(C,c))],P _(PowerClass)}  Equation (23)

In certain representative embodiments, it may be expressed as:

P _(CMAX) _(—) _(L) =P _(PowerClass)+10 log₁₀ ΣMIN[p _(EMAX,c)/(P_(PowerClass) ·Δt _(C,c)),1/(mpr_(c)·a-mpr_(c) ·t _(C,c)),1/(pmpr_(c)·Δt _(C,c))]  Equation (24)

Or, with a P_(PowerClass) limit as set forth in Equation 25:

P _(CMAX) _(—) _(L)=MIN{P _(PowerClass)+10 log₁₀ ΣMIN[p _(EMAX,c)/(p_(PowerClass) ·Δt _(C,c)),1/(mpr_(c)·a-mpr_(c) ·Δt _(C,c)),1/(pmpr_(c)·Δt _(C,c))],P _(PowerClass)}  Equation (25)

There may be additional power reduction allowed, for example, for theinter-band case. This reduction may be referred to as IBR_(c) (e.g.,ibr_(c) in linear notation) for a given CC. These values may be the sameor different for different CCs. In that case, the P_(CMAX) _(—) _(L) maybe defined by one of the following equations:

P _(CMAX) _(—) _(L)=10 log₁₀ ΣMIN{p _(EMAX,c)/(Δt _(C,c)),p_(PowerClass)/(mpr_(c)·a-mpr_(c) ·Δt _(C,c)·ibr_(c)),p_(PowerClass)/(pmpr_(c) ·Δt _(C,c)·ibr_(c))};  Equation (26)

P _(CMAX) _(—) _(L)=10 log₁₀ ΣMIN{p _(EMAX,c)/(Δt _(C,c)·ibr_(c)),p_(PowerClass)/(mpr_(c)·a-mpr_(c) ·Δt _(C,c)·ibr_(c)),p_(PowerClass)/(pmpr_(c) ·Δt _(C,c)·ibr_(c))};  Equation (27)

P _(CMAX) _(—) _(L)=MIN{10 log₁₀ ΣMIN{p _(EMAX,c)/(Δt _(C,c)),p_(PowerClass)/(mpr_(c)·a-mpr_(c) ·Δt _(C,c)·ibr_(c)),p_(PowerClass)/(pmpr_(c) ·Δt _(C,c)·ibr_(c))},P _(PowerClass)};  Equation(28)

P _(CMAX) _(—) _(L)=MIN{10 log₁₀ ΣMIN{p _(EMAX,c)/(Δt _(C,c)·ibr_(c)),p_(PowerClass)/(mpr_(c)·a-mpr_(c) ·Δt _(C,c)·ibr_(c)),p_(PowerClass)/(pmpr_(c) ·Δt _(C,c)·ibr_(c))},P _(PowerClass)};and  Equation (29)

P _(CMAX) _(—) _(L)=MIN{10 log₁₀ ΣMIN{p _(EMAX,c)/(Δt _(C,c)·ibr_(c)),p_(PowerClass)/(mpr_(c)·a-mpr_(c) ·Δt _(C,c)·ibr_(c)),p_(PowerClass)/(pmpr_(c) ·Δt _(C,c)·ibr_(c))},P_(PowerClass)−IBR}.  Equation (30)

The P_(CMAX) _(—) _(L) may also be defined as one of the following toallow an overall P-MPR reduction for the WTRU 102:

P _(CMAX) _(—) _(L)=MIN{10 log₁₀ ΣMIN[p _(EMAX,c)/(Δt _(C,c)),p_(PowerClass)/(mpr_(c)·a-mpr_(c) ·Δt _(C,c)),p _(PowerClass)/(pmpr_(c)·Δt _(C,c))],P _(PowerClass)−MAX(P-MPR_(c))}  Equation (31)

where MAX(P-MPRc_(c)) is the largest P-MPR_(c) value among the CCs;

P _(CMAX) _(—) _(L)=MIN{10 log₁₀ ΣMIN[p _(EMAX,c)/(Δt _(C,c)),p_(PowerClass)/(mpr_(c)·a-mpr_(c) ·Δt _(C,c)),p _(PowerClass)/(pmpr_(c)·Δt _(C,c))],P _(PowerClass)−IBR−MAX(P-MPR_(c))};  Equation (32)

P _(CMAX) _(—) _(L)=MIN{10 log₁₀ ΣMIN{p _(EMAX,c)/(Δt _(C,c)),p_(PowerClass)/(mpr_(c)·a-mpr_(c) ·Δt _(C,c)·ibr_(c)),p_(PowerClass)/(pmpr_(c) ·Δt _(C,c)·ibr_(c))},P_(PowerClass)−MAX(P-MPR_(c))};  Equation (33)

P _(CMAX) _(—) _(L)=MIN{10 log₁₀ ΣMIN{p _(EMAX,c)/(Δt _(C,c)),p_(PowerClass)/(mpr_(c)·a-mpr_(c) ·Δt _(C,c)·ibr_(c)),p_(PowerClass)/(pmpr_(c) ·Δt _(C,c)·ibr_(c))},P_(PowerClass)−IBR−MAX(P-MPR_(c))};  Equation (34)

P _(CMAX) _(—) _(L)=MIN{10 log₁₀ ΣMIN{p _(EMAX,c)/(Δt _(C,c)·ibr_(c)),p_(PowerClass)/(mpr_(c)·a-mpr_(c) ·Δt _(C,c)·ibr_(c)),p_(PowerClass)/(pmpr_(c) ·Δt _(C,c)·ibr_(c))},P_(PowerClass)−MAX(P-MPR_(c))}; and  Equation (35)

P _(CMAX) _(—) _(L)=MIN{10 log₁₀ ΣMIN{p _(EMAX,c)/(Δt _(C,c)·ibr_(c)),p_(PowerClass)/(mpr_(c)·a-mpr_(c) ·Δt _(C,c)·ibr_(c)),p_(PowerClass)/(pmpr_(c) ·Δt _(C,c)·ibr_(c))},P_(PowerClass)−IBR−MAX(P-MPR_(c))}.  Equation (36)

IBR in the above equations may be a WTRU specific relaxation. The IBRmay be: (1) an independent value from the CC specific IBRc values, (2)the same as those values; or (3) a combination of those values such asthe maximum, the average, or the sum, among others. Combinations may beperformed in a linear format before converting to log format for theIBR.

It is contemplated that the equations described herein for inter-bandaggregation may be applied for intra-band aggregation, for exampleintra-band non-contiguous aggregation. In this case, one or more of theMPR, A-MPR, ΔT_(C) and/or the P-MPR may be specified per carrier or peraggregated contiguous carrier group.

For a WTRU 102 capable of supporting intra-band contiguous carrieraggregation (CA) and also capable of supporting inter-band CA, it may beuseful to account for additional insertion loss due to, for example, anadditional diplexer or other components in the RF front end. In thiscase, and/or other cases, the equations above may use an additional termto account for that insertion loss. The insertion loss may instead or inaddition (for example in whole or in part) be included in the allowedpower reduction specified for one of the existing terms in theequations.

In certain representative embodiments, a relationship between CCspecific values and WTRU specific values may be used in the maximumpower equations.

The relationship between certain values defined for the individual CCsand the values defined for the WTRU 102 may include one or more of thefollowing. For the intra-band CA case, the MPR may be defined for theWTRU 102 and each CC specific MPR_(c) may be set equal to the MPR. Forexample, with two CCs in the same band and with the MPR=1 dB for theWTRU 102, the WTRU 102 may be able to relax the P_(CMAX,c) for each CCby 1 dB and if both CCs are near the maximum such that their sum is toor would exceed P_(CMAX) (or alternatively Ppowerclass) the WTRU 102 maybe allowed to scale back power to not exceed the P_(CMAX) (oralternatively Ppowerclass) which may include the allowance to reduce theWTRU maximum power by, for example, 1 dB overall.

The term ΔT_(C,c) for a CC may be based on where the CC is in frequencyin the band. For the intra-band CA case, when the CC specific ΔT_(C,c)(e.g., all of the CC specific ΔT_(C,c)) are the same, ΔT_(C) for theWTRU 102 may be set equal to ΔT_(C,c). For the inter-band CA case, thismay be applicable on a per band (e.g., frequency band) basis.

For the intra-band CA case, when any of the CC specific ΔT_(C,c) aredifferent, ΔT_(C) may be set equal to the largest of the ΔT_(C,c)values. For the inter-band CA case, this may be applicable on a per band(e.g., frequency band) basis.

For the intra-band CA case, when any of the CC specific ΔT_(C,c) aredifferent, when frequency hopping is enabled, the ΔT_(C) may be setequal to the largest ΔT_(C,c) over both slots of a sub-frame. For theinter-band CA case, this may be applicable on a per band (e.g.,frequency band) basis.

For intra-band CA, if the A-MPR_(c) for any of the CCs is different,then the largest value may be used for the A-MPR value.

In certain representative embodiments, if frequency hopping is enabledand the RBs are changing from one slot to another and the A-MPR_(c) perslot changes for one or more CCs (e.g., any CC), the largest A-MPR_(c)value over the sub-frame may be used for the A-MPR value.

For intra-band CA, if the A-MPR_(c) values are equal for the aggregatedCCs, the A-MPR may be set equal to the A-MPR_(c). For the inter-band CAcase, this may be applicable on a per band (e.g., frequency band) basis.For the inter-band CA case, the A-MPR_(c) values may be applied per CC,as they have an additive effect.

One or more of the relationships described above for inter-band CA maybe applicable for intra-band CA with non-contiguous allocation.

In certain representative embodiments, a measured maximum power may beimplemented.

The maximum power values discussed earlier may be “configured” or targetvalues. When the WTRU 102 transmits, it may not transmit the exact valueit calculated since components from WTRU 102 to WTRU 102 may havevariations in performance, even from the same manufacturer. The WTRU 102may be permitted tolerances around the configured values when actuallytransmitting and in tests performed to determine if the WTRU 102 maximumoutput power is staying within the specified limits.

The measured maximum output power may be defined as follows. Themeasured maximum output power of the WTRU 102, which may be the measuredmaximum sum of the individual CC powers, (σp_(U,c))_(MAX) may be (or maybe required to be) within the following bounds:

P _(CMAX) _(—) _(L) −T(P _(CMAX) _(—) _(L))≦10 log₁₀(Σp_(U,c))_(MAX) ≦P_(CMAX) _(—) _(H) +T(P _(CMAX) _(—) _(H))  Equation (37)

where

-   -   p_(U,c) may be output power of a component carrier c in linear        scale;    -   P_(CMAX) _(—) _(L) and P_(CMAX) _(—) _(H) may be as defined        previously; and    -   T(P_(CMAX)) may be a tolerance value, for example defined by a        tolerance table, and may apply to P_(CMAX) _(—) _(L) and        P_(CMAX) _(—) _(H) separately.

Representative procedures may be implemented for preventing the WTRU 102from exceeding maximum transmit power with the UCI simultaneously on thePUCCH and the PUSCH for one-band operations.

A representative procedure of preventing the WTRU 102 from exceedingmaximum transmit power while transmitting the UCI simultaneously on thePUCCH and the PUSCH for one band operation, which may be expressed inseveral different forms, that are functionally equivalent, follows.

In certain representative embodiments, the {circumflex over(P)}_(CMAX)(i) may be replaced by either {circumflex over (P)}_(CMAX) or{circumflex over (P)}_(PowerClass).

In all forms, scaling of a channel (e.g., scaling the channel power)generally refers to multiplying the channel (e.g., the channel power) bya factor w, 0≦w≦1 such that scaling a channel by a factor of one isequivalent to not scaling the channel, and scaling the channel by afactor of zero is equivalent to not transmitting the channel.

The representative procedure may also be applicable in general to thecases of: (1) a PUCCH not being transmitted; and/or (2) a PUSCH (e.g.,with or without the UCI) not being transmitted, by setting therespective linear power terms of any non-transmitted channels to zero.

In a first form (e.g., form 1), when the UCI is simultaneouslytransmitted on the PUCCH and the PUSCH, if the total transmit power ofthe WTRU 102 is to or would exceed P_(CMAX), and the sum of the PUCCHpower plus PUSCH with UCI power may not or would not exceed P_(CMAX),the WTRU 102 may scale the PUSCHs (for example, all PUSCHs) without UCIequally. If the total transmit power of the WTRU 102 is to or wouldexceed P_(CMAX), and the sum of PUCCH power plus PUSCH with UCI power isto or would exceed P_(CMAX), the WTRU 102 may scale PUSCH with UCI, andmay not transmit any PUSCH without the UCI.

In a second form (e.g., form 2), when the UCI is simultaneouslytransmitted on the PUSCH in cell c=j and on the PUCCH, if {circumflexover (P)}_(CMAX)(i)−{circumflex over (P)}_(PUCCH)(i)−{circumflex over(P)}_(PUSCH,j)(i)≧0 then the WTRU 102 may scale {circumflex over(P)}_(PUSCH,c)(i) for serving cells (e.g., all serving cells) c≠j insubframe i such that the condition

${\sum\limits_{c \neq j}^{\;}\; {{w(i)} \cdot {{\hat{P}}_{{PUSCH},c}(i)}}} \leq {{{\hat{P}}_{CMAX}(i)} - {P_{PUCCH}(i)} - {{\hat{P}}_{{PUSCH},j}(i)}}$

is satisfied. Otherwise, the WTRU 102 may not transmit, {circumflex over(P)}_(PUSCH,c≠j)(i) and may scale {circumflex over (P)}_(PUSCH,c=j)(i)in subframe i such that the condition w(i)·{circumflex over(P)}_(PUSCH,j)(i)≦{circumflex over (P)}_(CMAX)(i)−{circumflex over(P)}_(PUSCH)(i) is satisfied. It is contemplated that w(i) values arethe same across serving cells c≠j when w(i)>0, but for certain servingcells w(i) may be zero. It is also contemplated that {circumflex over(P)}_(CMAX) may be the linear equivalent of P_(CMAX), and/or {circumflexover (P)}_(PUSCH,c) may be the linear equivalent of P_(PUSCH,c), amongothers.

In a third form (e.g., form 3), when the UCI is simultaneouslytransmitted on the PUSCH in cell c=j and on the PUCCH, if the totaltransmit power of the WTRU 102 may or would exceed the P_(CMAX), theWTRU 102 may scale {circumflex over (P)}_(PUSCH,c)(i) for all servingcells c in subframe i such that the condition:

$\begin{matrix}{{{{\sum\limits_{c \neq j}\; {{w_{c}(i)} \cdot {{\hat{P}}_{{PUSCH},c}(i)}}} + {{w_{j}(i)} \cdot {{\hat{P}}_{{PUSCH},j}(i)}}} \leq {{{\hat{P}}_{CMAX}(i)} - {{\hat{P}}_{PUCCH}(i)}}}{w_{c} = \{ {{{\begin{matrix}1 & {{c = j},{{{{\hat{P}}_{CMAX}(i)} - {{\hat{P}}_{PUCCH}(i)} - {{\hat{P}}_{{PUSCH},j}(i)}} \geq 0}} \\0 & {{c \neq j},{{{{\hat{P}}_{CMAX}(i)} - {{\hat{P}}_{PUCCH}(i)} - {{\hat{P}}_{{PUSCH},j}(i)}} \leq 0}}\end{matrix}w_{c = n}} = {\{ {w_{c = m}0} \} {\forall{m \neq j}}}},{n \neq j}} }} & {{Equation}\mspace{14mu} (38)}\end{matrix}$

is satisfied. It is contemplated that {circumflex over (P)}_(CMAX) maybe the linear equivalent of P_(CMAX), and/or {circumflex over(P)}_(PUSCH,c) may be the linear equivalent of P_(PUSCH,c) among others.

In a fourth form (e.g., form 4), when UCI is simultaneously transmittedon the PUSCH in cell c=j and on the PUCCH, if the total transmit powerof the WTRU 102 may or would exceed the P_(CMAX), the WTRU 102 may scale{circumflex over (P)}_(PUSCH,c)(i) for all serving cells c in subframe isuch that the condition:

$\begin{matrix}{{{\sum\limits_{c}\; {{w_{c}(i)} \cdot {{\hat{P}}_{{PUSCH},c}(i)}}} \leq {{{\hat{P}}_{CMAX}(i)} - {{\hat{P}}_{PUCCH}(i)}}}{w_{c} = \{ {{{\begin{matrix}1 & {{c = j},{{{{\hat{P}}_{CMAX}(i)} - {{\hat{P}}_{PUCCH}(i)} - {{\hat{P}}_{{PUSCH},j}(i)}} \geq 0}} \\0 & {{c \neq j},{{{{\hat{P}}_{CMAX}(i)} - {{\hat{P}}_{PUCCH}(i)} - {{\hat{P}}_{{PUSCH},j}(i)}} \leq 0}}\end{matrix}w_{c = n}} = {\{ {w_{c = m}0} \} {\forall{m \neq j}}}},{n \neq j}} }} & {{Equation}\mspace{14mu} (39)}\end{matrix}$

It is contemplated that {circumflex over (P)}_(CMAX) may be the linearequivalent of P_(CMAX), and/or {circumflex over (P)}_(PUSCH,c) may bethe linear equivalent of P_(PUSCH,c), among others.

In certain representative embodiments, representative procedures may beimplemented for handling maximum power, for example for settingband-specific power limits, when the WTRU 102 may be operating in morethan one band, for example in inter-band carrier aggregation.

For inter-band operation, MPR, A-MPR, and ΔT_(C) may be different foreach band. P-MPR may be the same or different per band, for example,power reduction for a SAR (for example related to proximity of a WTRU toa human) may be the same for each band, but the power reduction forsimultaneous 1X-EVDO may be different for each band.

To support this case, an MPR, an A-MPR, and/or a ΔT_(C) may be definedas functions of the band (e.g., frequency band) in addition to the otherparameters they may be a function of. The P-MPR may be defined as themaximum allowed power reduction for the WTRU 102 that, if appliedequally to the bands, may become the maximum allowed reduction per bandand per CC. In certain representative embodiments, a P-MPR may bedefined per band or there may be a P-MPR component for the WTRU 102 anda P-MPR per band.

The power of each band may be limited by the power class and thereduction factors for that band. For example, the WTRU 102 may determinethe allowed maximum output power per band, P_(CMAX,b), from (or the WTRU102 may be allowed to set its configured maximum output power on band b,P_(CMAX,b), within the following bounds):

P _(CMAX) _(—) _(L,b) ≦P _(CMAX,b) ≦P _(CMAX) _(—) _(H,b)  Equation (40)

where for the case when there may be one P-MPR for the WTRU 102:

P _(CMAX) _(—) _(L,b)=MIN{P _(EMAX,b) −ΔT _(C,b) ,P_(PowerClass)−MAX(MPR_(b)+A-MPR_(b),P-MPR)−ΔT _(C,b)}  Equation (41)

P _(CMAX) _(—) _(H,b)=MIN{P _(EMAX,b) ,P _(PowerClass)}  Equation (42)

where P_(EMAX,b) may be a power limit signaled by the eNB 140, e.g., viaRRC signaling, for the band or may be a value computed from theindividual signaled power limits for each CC, P_(EMAX,c) in the band.

As an example, P_(EMAX,b)=10 log 10Σp_(EMAX,c) where the sum may becomputed for the CCs c in the band b and where P_(EMAX,c) may be thepower limit signaled by the eNB 140, e.g., via RRC signaling, forexample, in the P-Max IE, for each CC in band b. p_(EMAX,c) may be thevalue of P_(EMAX,c) expressed in linear notation. A subscript of b mayindicate a value for band b. For example, if P-MPR is different fordifferent bands, P-MPR may be replaced by P-MPR_(b). It is contemplatedthat the b subscripts may not be used in the equations for values thatare understood to be a function of the band.

For each CC, the following may apply:

P _(CMAX) _(—) _(L,c) ≦P _(CMAX,c) ≦P _(CMAX) _(—) _(H,c)  Equation (43)

where

P_(CMAX) _(—) _(L,c)=MIN{P_(EMAX,c)−ΔT_(C),P_(PowerClass)−MAX(MPR_(c)+A-MPR_(c), P-MPR_(c))−ΔT_(Cc)};

P_(CMAX) _(—) _(H,c)=MIN{P_(EMAX,c), P_(PowerClass)};

P_(EMAX,c) may be a maximum power limit signaled by the higher layers(for the CC), for example signaled to the WTRU 102 by the eNB 140 in theP-Max IE;

and where MPR_(c), A-MPR_(c), and ΔT_(Cc) may be equal to the values forthe band the CC may be in. P-MPR_(c) may be equal to the P-MPR_(b) valuefor the band the CC is in if it is specified per band or it may be equalto the WTRU 102 specified P-MPR value.

The WTRU may configure an overall WTRU configured maximum output power,P_(CMAX), in addition to a configured maximum output power per bandP_(CMAX,b), which may be in addition to a configured maximum outputpower per CC, P_(CMAX,c). P_(CMAX) may be limited by the power class andmay be further limited by power reductions intended to compensate foreffects that are additive over the bands. For example, the adjacentchannel interference due to transmitting in one band may not be additivewith the adjacent channel interference due to transmitting in anotherband. The bounds of P_(CMAX) may be defined as follows:

P _(CMAX) _(—) _(L) ≦P _(CMAX) ≦P _(CMAX) _(—) _(H)  Equation (44)

where:P_(CMAX) _(—) _(L) may account for the signaled maximum power values forthe CCs and the allowed power reductions. P_(CMAX) _(—) _(H) may allowfor the signaled maximum power values for the CCs as well as the powerclass.

The decision point for power scaling and the rules for power scaling maybe modified to account for the band specific maximum power, P_(CMAX,b),in addition to the overall WTRU maximum power P_(CMAX). Exampleprocedures are described below.

In certain representative embodiments, representative procedures may beimplemented for handling maximum power, for example for setting rulesfor scaling, when the WTRU 102 may be operating in more than one band,for example in inter-band carrier aggregation.

The power scaling rules (or policies) may be defined such that if thesum of the computed powers of the CCs would or is to exceed the maximumpower of the power class, P_(PowerClass), the individual PUSCH channelpowers are or may be scaled, with a priority given to a PUSCH carryingthe UCI, for example a higher priority than that of a PUSCH not carryingthe UCI. A priority higher than that given to the PUSCH carrying UCI maybe given to a PUCCH and the PUCCH power may not be reduced in thescaling process. The P_(CMAX) may be used as the power limit instead ofP_(PowerClass) as shown in the following example which may be applicablefor the case of intra-band (e.g., single or contiguous band) CA.

In this example, if the total transmit power of the WTRU 102 would or isto exceed {circumflex over (P)}_(CMAX), the WTRU 102 scales or may scale{circumflex over (P)}_(PUSCH,c)(i) for the serving cell c in subframe iby a weight w(i) such that the condition:

$\begin{matrix}{{\sum\limits_{c}\; {{w(i)} \cdot {{\hat{P}}_{{PUSCH},c}(i)}}} \leq ( {{\hat{P}}_{CMAX} - {{\hat{P}}_{PUCCH}(i)}} )} & {{Equation}\mspace{14mu} (45)}\end{matrix}$

is satisfied.

If the WTRU 102 has a PUSCH transmission with the UCI on cell j, a PUSCHwithout the UCI on one or more of the remaining cells, and the totaltransmit power of the WTRU 102 would or is to exceed {circumflex over(P)}_(CMAX), the WTRU 102 scales or may scale {circumflex over(P)}_(PUSCH,c)(i) for the serving cells without the UCI in subframe i bya weight w(i) such that the condition:

$\begin{matrix}{{\sum\limits_{c \neq j}\; {{w(i)} \cdot {{\hat{P}}_{{PUSCH},c}(i)}}} \leq ( {{\hat{P}}_{CMAX} - {{\hat{P}}_{{PUSCH},j}(i)}} )} & {{Equation}\mspace{14mu} (46)}\end{matrix}$

is satisfied.

It is contemplated that in certain representative embodiments it may beappropriate to use {circumflex over (P)}_(CMAX)(i) instead of{circumflex over (P)}_(CMAX) in some or all of the above equations. Itis also contemplated that {circumflex over (P)}_(CMAX) or {tilde over(P)}_(CMAX) may be the linear equivalent of P_(CMAX), and/or {circumflexover (P)}_(PUSCH,c) or {tilde over (P)}_(PUSCH,c) may be the linearequivalent of P_(PUSCH,c), among others.

For the case in which there may be band specific power limits, forexample for inter-band CA which may have different values of MPR andother backoffs for each of the bands, there may be an additionalconstraint or constraints imposed by the maximum allowed power for eachband, P_(CMAX,b).

One or more of the following may apply. In a first example, the WTRU 102may perform scaling in a given band b if the sum of the computed powersof the CCs in that band would or is to exceed a maximum power for thatband. That maximum power may be P_(CMAX,b) or its linear equivalent.That maximum power may be subframe specific and may be P_(CMAX,b)(i) forsubframe i or its linear equivalent.

In a second example, the WTRU 102 may perform scaling on the computedchannel powers if one or more of the following is true: (1) the sum ofthe computed powers of the CCs in any band would or is to exceed amaximum power for that band (for example, the maximum power may beP_(CMAX,b) or its linear equivalent and/or the maximum power may besubframe specific and may be P_(CMAX,b)(i) for subframe i or its linearequivalent); (2) the sum of the computed powers over CCs (e.g., all CCs)in bands (e.g., all bands) would exceed or is to exceed the maximumpower defined for the WTRU 102 (for example, the maximum power may beP_(CMAX) or its linear equivalent and/or the maximum power may besubframe specific and may be P_(CMAX)(i) for subframe i or its linearequivalent).

In a third example, the WTRU 102 may perform scaling such that weights(e.g., all weights) of the PUSCHs not carrying the UCI may be equalregardless of the band each PUSCH may be in. The following constraintsmay be applied in determining the scaling weights for transmission insubframe i. It is contemplated that the weights w(i) greater than 0 maybe equal and for certain cells the weights may be zero. Applying therule/provisioning that PUSCHs (e.g., all PUSCHs not carrying the UCI)may be scaled equally, the following representative scaling algorithmmay be applied separately to each band (e.g., frequency band), as setforth in Equation 47:

$\begin{matrix}{{\sum\limits_{c \in b}\; {{w(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}} \leq {{{\overset{\sim}{P}}_{{CMAX},b}(i)} - {{\overset{\sim}{P}}_{PUCCH}(i)}}} & {{Equation}\mspace{14mu} (47)}\end{matrix}$

if one of the CCs in that band carries the PUCCH, or

$\begin{matrix}{{\sum\limits_{{c \in b},{c \neq j}}\; {{w(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}} \leq {{{\overset{\sim}{P}}_{{CMAX},b}(i)} - {{\overset{\sim}{P}}_{{PUSCH},j}(i)}}} & {{Equation}\mspace{14mu} (48)}\end{matrix}$

if one of the CCs, j, in that band carries a PUSCH with a UCI, or

$\begin{matrix}{{\sum\limits_{c \in b}\; {{w(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}} \leq {{\overset{\sim}{P}}_{{CMAX},b}(i)}} & {{Equation}\mspace{14mu} (49)}\end{matrix}$

if none of the CCs in that band carry a PUCCH or a PUSCH with a UCI,where: cεb indicates or means all carriers, c, in band b, w(i) may bethe scaling weight applied to PUSCHs (e.g., all PUSCHs) not carrying theUCI in subframe i, P_(PUCCH)(i) may be the transmit power of the PUCCH(e.g., the PUCCH in band b or the PUCCH in any band) in subframe i, and{tilde over (P)} may be the linear equivalent of a quantity expressed indBm or in log form.

The one (e.g., the one non-zero) scaling weight w(i) may be chosen bythe WTRU 102 such that for each band the applicable (e.g., all of theapplicable) above constraints may be satisfied. The WTRU 102 may choosethe weight such that the applicable constraint or constraints formaximum per-band transmit power, for each band (for example theapplicable above constraints for each band), and also the followingapplicable constraint for maximum WTRU transmit power may be satisfied.

If there is a PUCCH transmitted in subframe i, the WTRU 102 transmitpower constraint may be:

$\begin{matrix}{{\sum\limits_{c}\; {{{w(i)} \cdot {\overset{\sim}{P}}_{{PUSCH},c}}(i)}} \leq {{\overset{\sim}{P}}_{PowerClass} - {{{\overset{\sim}{P}}_{PUCCH}(i)}\mspace{14mu} {or}}}} & {{Equation}\mspace{14mu} (50)} \\{{\sum\limits_{c}\; {{{w(i)} \cdot {\overset{\sim}{P}}_{{PUSCH},c}}(i)}} \leq {{{\overset{\sim}{P}}_{CMAX}(i)} - {{\overset{\sim}{P}}_{PUCCH}(i)}}} & {{Equation}\mspace{14mu} (51)}\end{matrix}$

If there is a PUSCH with UCI transmitted in subframe i in CC j, the WTRU102 transmit power constraint may be:

$\begin{matrix}{{\sum\limits_{c \neq j}\; {{{w(i)} \cdot {\overset{\sim}{P}}_{{PUSCH},c}}(i)}} \leq {{\overset{\sim}{P}}_{PowerClass} - {{{\overset{\sim}{P}}_{{PUSCH},j}(i)}\mspace{14mu} {or}}}} & {{Equation}\mspace{14mu} (52)} \\{{\sum\limits_{c \neq j}\; {{{w(i)} \cdot {\overset{\sim}{P}}_{{PUSCH},c}}(i)}} \leq {{{\overset{\sim}{P}}_{CMAX}(i)} - {{\overset{\sim}{P}}_{{PUSCH},j}(i)}}} & {{Equation}\mspace{14mu} (53)}\end{matrix}$

If there is neither a PUCCH nor a PUSCH with a UCI transmitted insubframe i, the WTRU 102 transmit power constraint may be:

$\begin{matrix}{{\sum\limits_{c}\; {{w(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}} \leq {{\overset{\sim}{P}}_{PowerClass}\mspace{14mu} {or}}} & {{Equation}\mspace{14mu} (54)} \\{{\sum\limits_{c}\; {{w(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}} \leq {{\overset{\sim}{P}}_{CMAX}(i)}} & {{Equation}\mspace{14mu} (55)}\end{matrix}$

A fourth example may be an alternative to using one scaling weightfactor, w(i), for all PUSCHs which may not be carrying UCI. In thisexample, the WTRU 102 may use a separate scaling weighting factor,w_(b)(i), for the PUSCHs (e.g., all PUSCHs not carrying UCI) in band b.It is contemplated that for a given band b the weights w_(b)(i) greaterthan 0 may be equal, and for certain cells the weights may be 0. TheWTRU 102 may choose the weights w_(b)(i) such that the applicableconstraint or constraints for maximum per-band transmit power, for eachband, may be satisfied. In this example, the per band constraint may be:

$\begin{matrix}{{\sum\limits_{c \in b}\; {{w_{b}(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}} \leq {{{\overset{\sim}{P}}_{{CMAX},b}(i)} - {{\overset{\sim}{P}}_{PUCCH}(i)}}} & {{Equation}\mspace{14mu} (56)}\end{matrix}$

if one of the CCs in that band carries the PUCCH, or

$\begin{matrix}{{\sum\limits_{{c \in b},{c \neq j}}\; {{w_{b}(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}} \leq {{{\overset{\sim}{P}}_{{CMAX},b}(i)} - {{\overset{\sim}{P}}_{{PUSCH},j}(i)}}} & {{Equation}\mspace{14mu} (57)}\end{matrix}$

if one of the CCs, j, in that band carries a PUSCH with a UCI, or

$\begin{matrix}{{\sum\limits_{c \in b}\; {{w_{b}(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}} \leq {{\overset{\sim}{P}}_{{CMAX},b}(i)}} & {{Equation}\mspace{14mu} (58)}\end{matrix}$

if none of the CCs in that band carry a PUCCH or a PUSCH with a UCI.

The WTRU 102 may choose the weights w_(b)(i) such that the applicableconstraint or constraints for maximum per-band transmit power, for eachband, and also the applicable constraint for maximum WTRU transmit powermay be satisfied. In this example, the maximum WTRU 102 transmit powerconstraint may be:

$\begin{matrix}{{\sum\limits_{b}\; {\sum\limits_{c \in b}\; {{w_{b}(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}}} \leq {{\overset{\sim}{P}}_{PowerClass} - {{\overset{\sim}{P}}_{PUCCH}(i)}}} & {{Equation}\mspace{14mu} (59)}\end{matrix}$

if one of the CCs in any band carries the PUCCH; or

$\begin{matrix}{{\sum\limits_{b}\; {\sum\limits_{{c \in b},{c \neq j}}\; {{w_{b}(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}}} \leq {{\overset{\sim}{P}}_{PowerClass} - {{\overset{\sim}{P}}_{{PUSCH},j}(i)}}} & {{Equation}\mspace{14mu} (60)}\end{matrix}$

if one of the CCs in any band carries the PUSCH with a UCI, or

$\begin{matrix}{{\sum\limits_{b}\; {\sum\limits_{c \in b}\; {{w_{b}(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}}} \leq {\overset{\sim}{P}}_{PowerClass}} & {{Equation}\mspace{14mu} (61)}\end{matrix}$

if none of the CCs in any band carries the PUCCH or the PUSCH with theUCI. In each of the above equations, {tilde over (P)}_(PowerClass) maybe replaced by {tilde over (P)}_(CMAX)(i) or {tilde over (P)}_(CMAX).

A fifth example may be another alternative where the WTRU 102 may use aweighting factor w_(b)(i), for PUSCHs (e.g., all PUSCHs not carrying theUCI) in band b and may use a weighting factor w_(u)(i) to further scalethe channel powers to satisfy the WTRU maximum power constraint. It iscontemplated that the weights w_(b)(i) greater than 0 may be equal for agiven band b and weights w_(u)(i) greater than 0 may be equal, and forcertain cells the weights may be 0. The WTRU 102 may choose the weightsto satisfy the per band constraint for each band and the WTRU transmitpower constraint. Satisfying all the combinations of band and WTRUconstraints may be accomplished by satisfying the per band constraintfirst and then the WTRU constraint. In this example, the per bandconstraint may be:

$\begin{matrix}{{\sum\limits_{c \in b}\; {w_{b}{(i) \cdot {\overset{\sim}{P}}_{{PUSCH},c}}(i)}} \leq {{{\overset{\sim}{P}}_{{CMAX},b}(i)} - {{\overset{\sim}{P}}_{PUCCH}(i)}}} & {{Equation}\mspace{14mu} (62)}\end{matrix}$

if one of the CCs in that band carries the PUCCH, or

$\begin{matrix}{{\sum\limits_{{c \in b},{c \neq j}}\; {w_{b}{(i) \cdot {\overset{\sim}{P}}_{{PUSCH},c}}(i)}} \leq {{{\overset{\sim}{P}}_{{CMAX},b}(i)} - {{\overset{\sim}{P}}_{{PUSCH},j}(i)}}} & {{Equation}\mspace{14mu} (63)}\end{matrix}$

if one of the CCs, j, in that band carries a PUSCH with a UCI, or

$\begin{matrix}{{\sum\limits_{c \in b}\; {w_{b}{(i) \cdot {\overset{\sim}{P}}_{{PUSCH},c}}(i)}} \leq {{\overset{\sim}{P}}_{{CMAX},b}(i)}} & {{Equation}\mspace{14mu} (64)}\end{matrix}$

if none of the CCs in that band carry a PUCCH or a PUSCH with a UCI. Inthis example, the maximum WTRU transmit power constraint may be:

$\begin{matrix}{{{w_{u}(i)}{\sum\limits_{b}\; {\sum\limits_{c \in b}\; {{w_{b}(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}}}} \leq {{\overset{\sim}{P}}_{PowerClass} - {{\overset{\sim}{P}}_{PUCCH}(i)}}} & {{Equation}\mspace{14mu} (65)}\end{matrix}$

if one of the CCs in any band carries the PUCCH; or

$\begin{matrix}{{{w_{u}(i)}{\sum\limits_{b}{\sum\limits_{{c \in b},{c \neq j}}\; {w_{b}{(i) \cdot {\overset{\sim}{P}}_{{PUSCH},c}}(i)}}}} \leq {{\overset{\sim}{P}}_{PowerClass} - {{\overset{\sim}{P}}_{{PUSCH},j}(i)}}} & {{Equation}\mspace{14mu} (66)}\end{matrix}$

if one of the CCs in any band carries a PUSCH with a UCI, or

$\begin{matrix}{{{w_{u}(i)}{\sum\limits_{b}\; {\sum\limits_{c \in b}\; {{w_{b}(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}}}} \leq {\overset{\sim}{P}}_{PowerClass}} & {{Equation}\mspace{14mu} (67)}\end{matrix}$

if none of the CCs in any band carries a PUCCH or a PUSCH with a UCI. Ineach of the above equations, {tilde over (P)}_(PowerClass) may bereplaced by {tilde over (P)}_(CMAX)(i) or {tilde over (P)}_(CMAX).

One of skill understands that these constraints, in all of thealternative embodiments, may be extended to cover the case of multiplePUCCHs in a subframe and/or one or more PUCCH(s) and/or one or morePUSCH(s) with UCI in the same subframe.

In certain representative embodiments, representative procedures may beimplemented for preventing the WTRU 102 from exceeding maximum transmitpower, including the case of the UCI simultaneously on the PUCCH and thePUSCH for multiple band operation.

It is contemplated that the WTRU may at times transmit PUCCH carryingcertain UCI (e.g., ACK/NACK) and PUSCH carrying certain (e.g., other)UCI simultaneously. The PUCCH and the PUSCH carrying UCI may be in thesame or different bands. The power scaling rules (or policies), theconstraints for maximum per-band transmit power, and the constraints formaximum WTRU transmit power described previously may be modified and newpower scaling rules (or policies) and constraints may be added toinclude this possibility.

One or more of the following may apply. In a first example, the WTRU 102may perform scaling in a given band b if the sum of the computed powersof the CCs in that band would or is to exceed a maximum power for thatband. That maximum power maybe P_(CMAX,b) or its linear equivalent. Thatmaximum power may be subframe specific and may be P_(CMAX,b)(i) forsubframe i or its linear equivalent.

In a second example, the WTRU 102 may perform scaling on the computedchannel powers if one or more of the following is true: (1) the sum ofthe computed powers of the CCs in any band would or is to exceed amaximum power for that band (for example, the maximum power maybeP_(CMAX,b) or its linear equivalent and/or the maximum power may besubframe specific and may be P_(CMAX,b)(i) for subframe i or its linearequivalent); (2) the sum of the computed powers over CCs (e.g., all CCs)in bands (e.g., all bands) would or is to exceed the maximum powerdefined for the WTRU 102 (for example, that maximum power may beP_(CMAX) or its linear equivalent and/or the maximum power may besubframe specific and may be P_(CMAX)(i) for subframe i or its linearequivalent).

In a third example, the WTRU 102 may perform scaling such that weights(e.g., all weights) of the PUSCHs not carrying the UCI may be equalregardless of the band each PUSCH may be in. In this case, the followingconstraints may be applied in determining the scaling weight fortransmission in subframe i. It is contemplated that for scaling theweights w(i) greater than 0 may be equal, and for certain cells theweights may be 0. Applying the rule/provisions that PUSCHs (e.g., allPUSCHs not carrying the UCI) may be scaled equally, the followingexample scaling algorithm may be applied separately to each band, as setforth in Equation 68:

$\begin{matrix}{{\sum\limits_{c \in b}\; {{w(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}} \leq {{{\overset{\sim}{P}}_{{CMAX},b}(i)} - {{\overset{\sim}{P}}_{PUCCH}(i)}}} & {{Equation}\mspace{14mu} (68)}\end{matrix}$

if one of the CCs in that band carries the PUCCH and there is no PUSCHwith a UCI in the band, or

$\begin{matrix}{{\sum\limits_{{c \in b},{c \neq j}}\; {{w(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}} \leq {{{\overset{\sim}{P}}_{{CMAX},b}(i)} - {{\overset{\sim}{P}}_{{PUSCH},j}(i)}}} & {{Equation}\mspace{14mu} (69)}\end{matrix}$

if one of the CCs, j, in that band carries a PUSCH with a UCI and thereis no PUCCH in the band, or

$\begin{matrix}{{\sum\limits_{c \in b}\; {{w(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}} \leq {{\overset{\sim}{P}}_{{CMAX},b}(i)}} & {{Equation}\mspace{14mu} (70)}\end{matrix}$

if none of the CCs in that band carry a PUCCH or a PUSCH with a UCI, or

$\begin{matrix}{{{\hat{P}}_{{PUSCH},j}(i)} = {{\min ( {{{\hat{P}}_{{PUSCH},j}(i)},( {{{\hat{P}}_{CMAX}(i)} - {{\hat{P}}_{PUCCH}(i)}} )} )}\mspace{14mu} {and}}} & {{Equation}\mspace{14mu} (71)} \\{{\sum\limits_{{c \in b}{c \neq j}}\; {{w(i)} \cdot {{\hat{P}}_{{PUSCH},c}(i)}}} \leq ( {{{\hat{P}}_{CMAX}(i)} - {{\hat{P}}_{PUCCH}(i)} - {{\hat{P}}_{{PUSCH},j}(i)}} )} & {{Equation}\mspace{14mu} (72)}\end{matrix}$

if one of the CCs in that band carries a PUCCH and one of the CCs inthat band (which may or may not be the same CC carrying the PUCCH)carries a PUSCH with a UCI, where: cεb indicates or means all carriers,c, in band b, w(i) may be the scaling weight applied to PUSCH (e.g., allPUSCHs) not carrying a UCI in subframe i, P_(PUCCH)(i) may be thetransmit power of the PUCCH in subframe i, and {tilde over (P)} or{circumflex over (P)} may be the linear equivalent of a quantityexpressed in dBm or in log form.

The one (e.g., the one non-zero) scaling weight w(i) or w_(c≠j)(i), maybe chosen by the WTRU 102 such that the applicable (e.g., all of theapplicable) above constraints may be satisfied. The WTRU 102 may choosethe weight such that the applicable constraint or constraints formaximum per-band transmit power, for each band (for example theapplicable above constraints for each band), and also the followingapplicable constraint for maximum WTRU 102 transmit power may besatisfied: If there is a PUCCH transmitted in subframe i, the WTRU 102transmit power constraint may be:

$\begin{matrix}{{\sum\limits_{c}\; {{w(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}} \leq {{\overset{\sim}{P}}_{PowerClass} - {{{\overset{\sim}{P}}_{PUCCH}(i)}\mspace{14mu} {or}}}} & {{Equation}\mspace{14mu} (73)} \\{{\sum\limits_{c}\; {{w(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}} \leq {{{\overset{\sim}{P}}_{CMAX}(i)} - {{\overset{\sim}{P}}_{PUCCH}(i)}}} & {{Equation}\mspace{14mu} (74)}\end{matrix}$

If there is a PUSCH with a UCI transmitted in subframe i in CC j, theWTRU transmit power constraint may be:

$\begin{matrix}{{\sum\limits_{c \neq j}\; {{w(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}} \leq {{\overset{\sim}{P}}_{PowerClass} - {{{\overset{\sim}{P}}_{{PUSCH},j}(i)}\mspace{14mu} {or}}}} & {{Equation}\mspace{14mu} (75)} \\{{\sum\limits_{c \neq j}\; {{{w(i)} \cdot {\overset{\sim}{P}}_{{PUSCH},c}}(i)}} \leq {{{\overset{\sim}{P}}_{CMAX}(i)} - {{\overset{\sim}{P}}_{{PUSCH},j}(i)}}} & {{Equation}\mspace{14mu} (76)}\end{matrix}$

If there is neither a PUCCH nor a PUSCH with a UCI transmitted insubframe i, the WTRU transmit power constraint may be:

$\begin{matrix}{{\sum\limits_{c}\; {{w(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}} \leq {{\overset{\sim}{P}}_{PowerClass}\mspace{14mu} {or}}} & {{Equation}\mspace{14mu} (77)} \\{{\sum\limits_{c}\; {{w(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}} \leq {{\overset{\sim}{P}}_{CMAX}(i)}} & {{Equation}\mspace{14mu} (78)}\end{matrix}$

If there is both a PUCCH and PUSCH with UCI in subframe i, the WTRUtransmit power constraint may be:

$\begin{matrix}{{{\hat{P}}_{{PUSCH},j}(i)} = {{\min ( {{{\hat{P}}_{{PUSCH},j}(i)},( {{\hat{P}}_{PowerClass} - {{\hat{P}}_{PUCCH}(i)}} )} )}\mspace{14mu} {Or}}} & {{Equation}\mspace{14mu} (79)} \\{{{\hat{P}}_{{PUSCH},j}(i)} = {{\min ( {{{\hat{P}}_{{PUSCH},j}(i)},( {{{\hat{P}}_{CMAX}(i)} - {{\hat{P}}_{PUCCH}(i)}} )} )}\mspace{14mu} {And}}} & {{Equation}\mspace{14mu} (80)} \\{{\sum\limits_{c \neq j}\; {{w(i)} \cdot {{\hat{P}}_{{PUSCH},c}(i)}}} \leq {( {{\hat{P}}_{PowerClass} - {{\hat{P}}_{PUCCH}(i)} - {{\hat{P}}_{{PUSCH},j}(i)}} )\mspace{14mu} {or}}} & {{Equation}\mspace{14mu} (81)} \\{{\sum\limits_{c \neq j}\; {{w(i)} \cdot {{\hat{P}}_{{PUSCH},c}(i)}}} \leq ( {{{\hat{P}}_{CMAX}(i)} - {{\hat{P}}_{PUCCH}(i)} - {{\hat{P}}_{{PUSCH},j}(i)}} )} & {{Equation}\mspace{14mu} (82)}\end{matrix}$

A fourth example may be an alternative to using one scaling weightfactor, w(i), for PUSCHs (e.g., all PUSCHs which may not be carryingUCI). In this example, the WTRU 102 may use a separate scaling weightingfactor, w_(b)(i), for PUSCHs (e.g., all PUSCHs not carrying UCI) in bandb. It is contemplated that for a given band b the weights w_(b)(i)greater than 0 may be equal, and for certain cells the weights may be 0.The WTRU 102 may choose the weights w_(b)(i) such that the applicableconstraint or constraints for maximum per-band transmit power, for eachband, may be satisfied. In this example, the per band constraint may be:

$\begin{matrix}{{\sum\limits_{c \in b}\; {{w_{b}(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}} \leq {{{\overset{\sim}{P}}_{{CMAX},b}(i)} - {{\overset{\sim}{P}}_{PUCCH}(i)}}} & {{Equation}\mspace{14mu} (83)}\end{matrix}$

if one of the CCs in that band carries the PUCCH and there is no PUSCHwith a UCI in the band, or

$\begin{matrix}{{\sum\limits_{{c \in b},{c \neq j}}\; {{w_{b}(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}} \leq {{{\overset{\sim}{P}}_{{CMAX},b}(i)} - {{\overset{\sim}{P}}_{{PUSCH},j}(i)}}} & {{Equation}\mspace{14mu} (84)}\end{matrix}$

if one of the CCs, j, in that band carries a PUSCH with a UCI and thereis no PUCCH in the band, or

$\begin{matrix}{{\sum\limits_{c \in b}\; {{w_{b}(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}} \leq {{\overset{\sim}{P}}_{{CMAX},b}(i)}} & {{Equation}\mspace{14mu} (85)}\end{matrix}$

if none of the CCs in that band carry a PUCCH or a PUSCH with a UCI, or

$\begin{matrix}{{{\hat{P}}_{{PUSCH},j}(i)} = {{\min ( {{{\hat{P}}_{{PUSCH},j}(i)},( {{{\hat{P}}_{CMAX}(i)} - {{\hat{P}}_{PUCCH}(i)}} )} )}\mspace{14mu} {and}}} & {{Equation}\mspace{14mu} (86)} \\{{\sum\limits_{c \neq j}\; {{w_{b}(i)} \cdot {{\hat{P}}_{{PUSCH},c}(i)}}} \leq ( {{{\hat{P}}_{CMAX}(i)} - {{\hat{P}}_{PUCCH}(i)} - {{\hat{P}}_{{PUSCH},j}(i)}} )} & {{Equation}\mspace{14mu} (87)}\end{matrix}$

if one of the CCs in that band carries a PUCCH and one of the CCs inthat band (which may or may not be the same CC carrying the PUCCH)carries a PUSCH with a UCI.

The WTRU 102 may choose the weights w_(b)(i) such that the applicableconstraint or constraints for maximum per-band transmit power, for eachband, and also the applicable constraint for maximum WTRU transmit powermay be satisfied. In this example, the maximum WTRU 102 transmit powerconstraint may be:

$\begin{matrix}{{\sum\limits_{b}\; {\sum\limits_{c \in b}\; {{w_{b}(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}}} \leq {{\overset{\sim}{P}}_{PowerClass} - {{\overset{\sim}{P}}_{PUCCH}(i)}}} & {{Equation}\mspace{14mu} (88)}\end{matrix}$

if one of the CCs in any band carries the PUCCH and there is no PUSCHwith a UCI in any band; or

$\begin{matrix}{{\sum\limits_{b}\; {\sum\limits_{{c \in b},{c \neq j}}\; {{w_{b}(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}}} \leq {{\overset{\sim}{P}}_{PowerClass} - {{\overset{\sim}{P}}_{{PUSCH},j}(i)}}} & {{Equation}\mspace{14mu} (89)}\end{matrix}$

if one of the CCs in any band carries the PUSCH with a UCI and there isno PUCCH in any band, or

$\begin{matrix}{{\sum\limits_{b}\; {\sum\limits_{c \in b}\; {{w_{b}(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}}} \leq {\overset{\sim}{P}}_{PowerClass}} & {{Equation}\mspace{14mu} (90)}\end{matrix}$

if none of the CCs in any band carries the PUCCH or the PUSCH with theUCI or

$\begin{matrix}{{{\hat{P}}_{{PUSCH},j}(i)} = {{\min ( {{{\hat{P}}_{{PUSCH},j}(i)},( {{\hat{P}}_{PowerClass} - {{\hat{P}}_{PUCCH}(i)}} )} )}\mspace{14mu} {and}}} & {{Equation}\mspace{14mu} (91)} \\{{\sum\limits_{b}\; {\sum\limits_{{c \neq j}{c \in b}}\; {{w_{b}(i)} \cdot {{\hat{P}}_{{PUSCH},c}(i)}}}} \leq {{\hat{P}}_{PowerClass} - {{\hat{P}}_{PUCCH}(i)} - {P_{{PUSCH},j}(i)}}} & {{Equation}\mspace{14mu} (92)}\end{matrix}$

if a CC in any band carries the PUCCH and a CC in any band carries thePUSCH with a UCI.In each of the above equations, {tilde over (P)}_(PowerClass) or{circumflex over (P)}_(PowerClass) may be replaced by {tilde over(P)}_(CMAX)(i) or {circumflex over (P)}_(CMAX) (i) or by {tilde over(P)}_(CMAX) or {circumflex over (P)}_(CMAX).

A fifth example may be another alternative where the WTRU 102 may use aweighting factor w_(b)(i), for PUSCH (e.g., all PUSCHs not carrying theUCI) in band b and use a weighting factor w_(u)(i) to further scale thechannel powers to satisfy the WTRU maximum power constraint. It iscontemplated that the weights w_(b)(i) greater than 0 may be equal for agiven band b and weights w_(u)(i) greater than 0 may be equal, and forcertain cells the weights may be 0. The WTRU 102 may choose the weightsto satisfy the per band constraint for each band and the WTRU transmitpower constraint. Satisfying all the combinations of band and WTRUconstraints may be accomplished by satisfying the per band constraintfirst and then the WTRU constraint. In this example, the per bandconstraint may be:

$\begin{matrix}{{{w_{u}(i)}{\sum\limits_{c \in b}\; {{w_{b}(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}}} \leq {{{\overset{\sim}{P}}_{{CMAX},b}(i)} - {{\overset{\sim}{P}}_{PUCCH}(i)}}} & {{Equation}\mspace{14mu} (93)}\end{matrix}$

if one of the CCs in that band carries the PUCCH,

or

$\begin{matrix}{{{w_{u}(i)}{\sum\limits_{{c \in b},{c \neq j}}\; {{w_{b}(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}}} \leq {{{\overset{\sim}{P}}_{{CMAX},b}(i)} - {{\overset{\sim}{P}}_{{PUSCH},j}(i)}}} & {{Equation}\mspace{14mu} (94)}\end{matrix}$

if one of the CCs, j, in that band carries a PUSCH with a UCI,

or

$\begin{matrix}{{{w_{u}(i)}{\sum\limits_{c \in b}\; {{w_{b}(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}}} \leq {{\overset{\sim}{P}}_{{CMAX},b}(i)}} & {{Equation}\mspace{14mu} (95)}\end{matrix}$

if none of the CCs in that band carry the PUCCH or the PUSCH with theUCI. In this example, the maximum WTRU transmit power constraint may be:

$\begin{matrix}{{{w_{u}(i)}{\sum\limits_{b}\; {\sum\limits_{c \in b}{{w_{b}(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}}}} \leq {{\overset{\sim}{P}}_{PowerClass} - {{\overset{\sim}{P}}_{PUCCH}(i)}}} & {{Equation}\mspace{14mu} (96)}\end{matrix}$

if one of the CCs in any band carries the PUCCH; or

$\begin{matrix}{{{w_{u}(i)}{\sum\limits_{b}\; {\sum\limits_{{c \in b},{c \neq j}}\; {{w_{b}(i)} \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}}}} \leq {{\overset{\sim}{P}}_{PowerClass} - {{\overset{\sim}{P}}_{{PUSCH},j}(i)}}} & {{Equation}\mspace{14mu} (97)}\end{matrix}$

if one of the CCs in any band carries a PUSCH with a UCI, or

$\begin{matrix}{{{w_{u}(i)}{\sum\limits_{b}\; {\sum\limits_{c \in b}{w_{b}{(i) \cdot {{\overset{\sim}{P}}_{{PUSCH},c}(i)}}}}}} \leq {\overset{\sim}{P}}_{PowerClass}} & {{Equation}\mspace{14mu} (98)}\end{matrix}$

if none of the CCs in any band carries a PUCCH or a PUSCH with a UCI, or

$\begin{matrix}{{{\hat{P}}_{{PUSCH},j}(i)} = {{\min ( {{{\hat{P}}_{{PUSCH},j}(i)},( {{\hat{P}}_{PowerClass} - {{\hat{P}}_{PUCCH}(i)}} )} )}\mspace{14mu} {and}}} & {{Equation}\mspace{14mu} (99)} \\{{{w_{u}(i)}{\sum\limits_{b}\; {\sum\limits_{{c \neq j}{c \in b}}{{{w_{b}(i)} \cdot {\hat{P}}_{{PUSCH},c}}(i)}}}} \leq {{\hat{P}}_{PowerClass} - {{\hat{P}}_{PUCCH}(i)} - {P_{{PUSCH},j}(i)}}} & {{Equation}\mspace{14mu} (100)}\end{matrix}$

if a CC in any band carries the PUCCH and a CC in any band carries thePUSCH with a UCI. In each of the above equations, {tilde over(P)}_(PowerClass) may be replaced by {tilde over (P)}_(CMAX) (i) or{tilde over (P)}CMAX.

One of skill understands that these constraints, in all of thealternatives, may be extended to cover the case of multiple PUCCHs in asubframe and/or one or more PUCCHs and PUSCHs with UCI in the samesubframe.

In certain representative embodiments, representative procedures may beimplemented including signaling related to additional or non-MPRbackoff.

New signaling may be added from the WTRU 102 to the eNB 140 to assistthe eNB 140 in understanding when and how additional backoff (or non-MPReffects) may be impacting (or providing an influence to) the WTRU 102.Signaling by the WTRU 102 to the eNB 140 may include one or more of thefollowing. The WTRU 102 may provide an indication as to whether the MPRor non-MPR effects may be dominating in the determination of theP_(CMAX) and/or the P_(CMAX,c). The WTRU 102 may include this indicationwith the PHR. The WTRU 102 may include this (e.g., the domination)information in a MAC CE. The WTRU 102 may send this (e.g., thedomination) information via RRC signaling. The indication may be per CCor may be one indication (e.g., composite indication) for the WTRU 102.The WTRU 102 may trigger a PHR report when the dominating factor (MPRbackoff or non-MPR backoff) changes.

In certain representative embodiments, representative procedures may beimplemented relating to power headroom and PHR triggering.

A WTRU's simultaneous transmission on LTE and another air interfacetechnology, or SAR requirements/limits may result in power managementbased backoff (P-MPR). These effects may be referred to as burstytraffic. An example of bursty traffic may be a 1xEV-DO datatransmission, 1xRTT talk spurt and/or SAR requirements/limits (which mayfor example be associated with certain scenarios such as when a WTRU isin close proximity to a human), among others.

During bursty traffic or SAR requirement/limits, among other scenarios,the P-MPR backoff may vary and/or the impact of P-MPR backoff on theP_(CMAX) or the P_(CMAX,c) may vary. Other conditions related to P-MPRmay vary such as whether or not the P-MPR dominates, (e.g., has aneffect on), the value of P_(CMAX) (or P_(CMAX,c)). It may be useful totrigger PHR based on changes to one or more of the conditions above,such as changes in P-MPR greater than a threshold, changes in the impactof P-MPR on the P_(CMAX) or the P_(CMAX,c), and/or other changes relatedto the P-MPR, among others.

In certain representative embodiments, such as in the case of burstytraffic or SAR requirements/limits, the triggering conditions may haveshort-term variations. These may be so short that the scheduler may nothave time to act on them and effect grants in the given time period.

Representative procedures for handling rapidly changing additionalbackoff have already been presented herein which include, for example,ignoring changes (e.g., drops in P-MPR) until such changes persist forsome period of time.

When triggering PHR based on changes in P-MPR, it may be useful toignore short-term drops in P-MPR backoff, and not ignore increases inP-MPR backoff. It may be useful to minimize cases where the schedulermay be unaware of the highest P-MPR backoff level in a time period tominimize scheduling of uplink grants that exceed available transmissionpower.

It is contemplated that for multiple CCs, there may be a separate P-MPRvalue per CC, P-MPR,c. When there is P-MPR,c, the changes (for examplechanges which may result in a PHR trigger) described may be changes inP-MPR,c, impact of P-MPR,c on P_(CMAX,c), and/or whether or not P-MPR,cdominates P_(CMAX,c), among others.

In certain representative embodiments, representative procedures may beimplemented for handling short-term variations in PHR triggeringconditions.

Representative procedures for reducing PHR triggers due to short-termvariations in the PHR triggering conditions are disclosed herein. Forexample, PH reporting for short-term drops in P-MPR backoff may beminimized while fast reporting of increases in P-MPR backoff may bemaintained. For fast varying P-MPR backoff, the higher P-MPR backoffvalue may be reported to the scheduler so that uplink grants exceedingavailable transmission power may be minimized. In some representativeembodiments, the procedures may include determining a P-MPR backoffvalue that may be different from the value in the current TTI fordetermination of P-MPR change (e.g., as compared to a) thresholdtriggering and calculation of the P_(CMAX,c) in the PHR. In certainrepresentative embodiments, the determined P-MPR backoff value may bethe maximum value recorded in a given time period preceding the currentTTI.

One of skill understands that elements/portions of representativeprocedures/embodiments described herein may be used individually or inany combination.

In certain representative embodiments, representative procedures may beimplemented using a lookback window.

The WTRU 102 may use a lookback window or the equivalent to determinethe value of P-MPR backoff and/or P-MPR,c backoff, among other purposes.For example, the P-MPR may be replaced by P-MPR,c for the case ofmultiple CCs or for the case of CC-specific P-MPR. The lookback windowmay have the same size (duration) as the PHR prohibit timer, a sizerelative to the PHR prohibit timer, and/or a different duration. The PHRprohibit timer may be the prohibit timer used for triggering PHR due topathloss change or may be a different timer (e.g., prohibit timer) thatmay be used for triggering PHR for other purposes such as P-MPR changesor changes in effect of P-MPR on the P_(CMAX) or the P_(CMAX,c) or anyother prohibit timer, among others.

One lookback window (e.g., a single lookback window) or multiplelookback windows may be implemented. When multiple lookback windows areimplemented, one may be used for increases (such as in P-MPR or effectsof P-MPR), and another may be used for decreases (such as in P-MPR oreffects of P-MPR). The lookback window may be configurable by dedicatedsignaling (e.g., RRC signaling). The value may be specified in number ofTTIs.

The lookback window is a generic term representing its function and anyname may be used for the function. In one example when the lookbackwindow relates to P-MPR backoff, it may be referred to as a P-MPRbackoff window or P-MPRbackoffWindow.

The use of the lookback window may be as follows. The PHR triggerrelated to the P-MPR may be based on changes in the P-MPR backoff. Incertain representative embodiments, the trigger may be based on: (1)changes in the effect of P-MPR on the P_(CMAX); (2) changes in theeffect of P-MPR on one or more P_(CMAX,c) values; (3) changes in theeffect of CC specific P-MPR, P-MPR,c, on P_(CMAX,c), and/or (4) changesin P_(CMAX,c), among other conditions. The lookback window may beapplied in other scenarios to accomplish a similar function as describedherein.

The WTRU 102 may use the lookback window in one or more of the followingways. The WTRU 102 may use the lookback window to look back in time overa set of values and choose one value such as the highest value, thelowest value, the average value or other combination of the values, theworst case value, the value with the most impact, or another valuerepresentative of the set of values in the window. As an example, forthe case of P-MPR, the WTRU 102 may choose the highest P-MPR backoffvalue calculated within the lookback window, where the highest value maybe or means the one value which results in the most scaling or reductionin power, (e.g., this may or may not be the highest numerical valuedepending on whether a dB scale or a linear scale is used).

The WTRU 102 may use the chosen value in the determination of whether ornot an event such as a PHR triggering event occurred. The event may beto determine whether a change threshold has been crossed and the chosenvalue in the lookback window may be used by the WTRU 102 for thisdetermination.

If a change threshold has been crossed, it may result in the WTRU 102triggering a PHR.

When a PHR is triggered based on a P-MPR triggering event, the highest(or other chosen) value of P-MPR (or P-MPR,c) within the lookback windowmay be the value the WTRU 102 uses in the computation of P_(CMAX),cprovided in the PHR.

When PHR is triggered based on a P-MPR triggering event, the highest (orother chosen) value of P-MPR (or P-MPR,c) within the lookback window maybe the value the WTRU 102 uses in the computation of P_(CMAX,c) and fordetermining power headroom (PH) for a given CC which the WTRU 102 mayinclude in the PHR. This may be applicable to Type 1 (PUSCH) and/or Type2 (PUSCH+PUCCH) power headroom.

When the PHR is triggered based on a P-MPR triggering event, the highest(or other chosen) value of P-MPR (or P-MPR,c) within the lookback windowmay be the value the WTRU 102 may use in the determination as to whetherP-MPR (or P-MPR,c) is dominating (e.g., is affecting) the P_(CMAX),cvalue the WTRU 102 is reporting.

When the PHR is triggered based on another triggering event such as achange in pathloss, reconfiguration, SCell activation, periodic PHRreport, or other event, the highest (or other chosen) value of P-MPR (orP-MPR,c) within the lookback window may be the value the WTRU 102 usesin the computation of P_(CMAX),c provided in the PHR.

When the PHR is triggered based on another triggering event such as achange in pathloss, reconfiguration, SCell activation, periodic PHRreport, or other event, the highest (or other chosen) value of P-MPR (orP-MPR,c) within the lookback window may be the value the WTRU 102 usesin the computation of P_(CMAX,c) and for determining power headroom (PH)for a given CC which the WTRU 102 may include in the PHR. This may beapplicable to Type 1 (PUSCH) and/or Type 2 (PUSCH+PUCCH) power headroom.

When the PHR is triggered based on another triggering event such as achange in pathloss, reconfiguration, SCell activation, periodic PHRreport, or other event, the highest (or other chosen) value of P-MPR (orP-MPR,c) within the lookback window may be the value the WTRU 102 usesin the determination as to whether P-MPR (or P-MPR,c) is dominating(e.g., is affecting) the P_(CMAX),c value the WTRU 102 is reporting.

The WTRU 102 may use the lookback window as follows. In each TTI (exceptpossibly in TTIs in which the WTRU 102 is unable or not permitted tosend PHR such as when a prohibit timer prohibits it or the WTRU 102 hasno UL grant or no room in the MAC-CE to send the PHR), the WTRU 102 maydo one or more of the following. The WTRU 102 may look back in time overthe lookback window time and determine the highest power managementbased backoff (e.g., P-MPR) value (e.g., the one resulting in the mostpower reduction) used by the WTRU 102 in that time period. This valuemay be less than or equal to the maximum allowed P-MPR value. In certainrepresentative embodiments, the WTRU 102 may choose (or determine) oneP-MPR value from the values in the lookback window. If there aremultiple CCs, a value may be separately chosen or determined for eachCC, and P-MPR may be P-MPR,c for each CC.

The WTRU 102 may compare the P-MPR value (e.g., the chosen or determinedP-MPR value) to the P-MPR value that was used in the last PHR todetermine if a PHR triggering event has occurred. If there are multipleCCs, this may be done separately for each CC and P-MPR may be P-MPR,cfor each CC.

The WTRU 102 may compare the effect of the P-MPR value (e.g., the chosenor determined P-MPR value) on P_(CMAX) or P_(CMAX,c) to the effect theP-MPR value had on P_(CMAX) or P_(CMAX,c) in the last PHR to determineif a PHR triggering event has occurred. If there are multiple CCs, thismay be done separately for each CC and P-MPR may be P-MPR,c for each CC.

The WTRU 102 may compare the P_(CMAX,c) value computed using the P-MPRvalue (e.g., the chosen or determined P-MPR value) to the P_(CMAX,c)value reported in the last PHR to determine if a PHR triggering eventhas occurred. If there are multiple CCs, this may be done separately foreach CC and P-MPR may be P-MPR,c for each CC.

The WTRU 102 may, alternatively, use some other comparison criteriausing the P-MPR value (e.g., the chosen or determined P-MPR value) andthe P-MPR value from the previous PHR to determine if a PHR triggeringevent has occurred. If there are multiple CCs, this may be doneseparately for each CC and P-MPR may be P-MPR,c for each CC.

If the difference in P-MPR values, or other criteria such as thedifference in the impact of P-MPR on P_(CMAX) or P_(CMAX,c), or thechange in P_(CMAX,c) changes by more than a threshold, the WTRU 102 maytrigger the PHR. If there are multiple CCs, this may be done separatelyfor each CC and P-MPR may be P-MPR,c for each CC. The WTRU 102 maytrigger PHR, if the criteria is met for any one or more of the CCs.

If separate P-MPR values are defined for each CC, the comparison on a CCbasis may use the CC specific values.

The WTRU 102 may trigger PHR, if the threshold criteria for any one ormore CCs is met.

If no threshold criteria is met, the WTRU 102 may not trigger PHR.

If PHR is triggered, the WTRU 102 may start the related prohibit timeror timers.

If PHR is triggered, the WTRU 102 may start any other prohibit timersthat may exist.

When sending the PHR report, the WTRU 102 may compute the reportedP_(CMAX,c) c values using the P-MPR or P-MPR,c value or values itobtained within the lookback window (e.g., the highest value or valuesin the lookback window).

When computing the PH for the PHR with respect to P_(CMAX,c) for eachCC, the WTRU 102 may compute the P_(CMAX,c) values to be used for the PHcomputation using the P-MPR or P-MPR,c value or values it obtainedwithin the lookback window (e.g., the highest value or values in thatwindow).

The values used for comparisons or triggering may be in linear form orlog form.

FIGS. 5 and 6 are diagrams illustrating representative triggeringprocedures using lookback windows (e.g., how the lookback windowoperates).

In certain representative procedures, reporting P-MPR or a level ofP-MPR (for example P-MPR level X) may be equivalent to including in aPHR P_(CMAX,c) which may include or account for P-MPR backoff which maybe at, of, or have a value of level X.

Referring to FIG. 5, in representative triggering procedure 500, theWTRU 102 may monitor or determine the P-MPR, which may vary over time.At a first time 510, the PHR may be triggered based on the P-MPR beingmonitored (or determined) to be at level C and the P-MPR may be reportedto network resources (e.g., eNB 140) in the PHR. At the first time, aprohibit timer may be set for a specified period. During the specifiedperiod until the prohibit timer expires another PHR may be prohibitedfrom being triggered. A lookback window may be established to determinea condition associated with the P-MPR during the lookback window. Thecondition may include one or more of: (1) the highest value of P-MPR inthe lookback window; (2) the worst value of the P-MPR in the lookbackwindow; and/or (3) the lowest value of P-MPR in the lookback window;among many others previously described above. The WTRU 102 may determinea value associated with a current interval (e.g., the current TTI) basedon the condition. For example, during a first interval (e.g., associatedwith a TTI) which may correspond to (for example begin at) a first time510, an associated lookback window may have a highest P-MPR in thelookback window which is at level C. Based on the determination that thelevel C P-MPR value corresponds to the first interval, the WTRU 102 maydetermine that the P-MPR has changed more than a threshold or the P-MPRdominates and/or other triggering criteria is satisfied and may send aPHR.

At a second time 520, after the prohibit timer has expired, and thelookback window no longer includes P-MPR values at level C, the highestP-MPR value in the lookback window associated with the second time 520is at level B. The WTRU 102 may trigger a PHR due to the change in P-MPRfrom level C to level B, for example, because the P-MPR may no longerdominate or the change may be larger than a threshold. After eachtriggering event the prohibit timer may be set for a specified time.

At a third time 530, after the prohibit timer expires, the P-MPR valuemay change to below level A and a pathloss trigger may occur and theWTRU 102 may report level B based on the highest P-MPR valuecorresponding to the lookback window instead of the actual level belowlevel A.

At a fourth time 540, just after the prohibit timer expires, the valueof P-MPR may be between level C and level D, having increased to level Dduring the time when PHR was prohibited and then decreasing to betweenlevel C and D. The WTRU 102 may trigger a PHR due to P-MPR dominatingand/or changing by a threshold amount (compared with the previouslyreported level B) and the WTRU 102 may report P-MPR level D based on thehighest P-MPR value corresponding to the lookback window instead of theactual level between levels C and D. Another prohibit timer may be setfor a specified time.

At a fifth time 550, after the prohibit timer expires, the value ofP-MPR may be at level B, having decreased to level B during the timewhen PHR was prohibited and remaining at level B. When the value ofP-MPR has been at level B sufficiently long such that the valuecorresponding to the lookback window is at level B, which occurs at time550, the WTRU 102 may trigger a PHR due to P-MPR dominating and/orchanging by a threshold amount and may report P-MPR level B.

In certain representative embodiments, the WTRU 102 may first determinewhether changes related to the P-MPR may be used as triggering criteria.This determination may be based on whether or not P-MPR is thedominating factor in (i.e., whether it has an effect on) the calculationof the P_(CMAX) (or P_(CMAX,c)). If there are multiple CCs, each ofthese determinations may be done separately for each CC.

If the P-MPR was not the dominating factor when the last PHR was sentand is not the dominating factor now (e.g., in this TTI), it may not beuseful to report PHR for changes related to P-MPR greater than aconfigured threshold. The WTRU 102 may skip the procedure fordetermining whether to trigger PHR based on changes related to theP-MPR. If there are multiple CCs, each of these determinations (e.g., ofwhich factor dominates or whether to trigger PHR) may be done separatelyfor each CC. The WTRU 102 may skip the procedure for determining whetherto trigger PHR based on changes related to the P-MPR for any CC forwhich this is true (e.g., for any CC for which the P-MPR, or P-MPR,c,was not the dominating factor when the last PHR was sent and is not thedominating factor now).

If the P-MPR was not the dominating factor when the last PHR was sentbut is the dominating factor now (e.g., in this TTI), then it may beuseful to report the PHR for changes related to P-MPR greater than aconfigured threshold. The WTRU 102 may apply the procedure fordetermining whether to trigger the PHR based on changes related to theP-MPR. If there are multiple CCs, each of these determinations (e.g., ofwhich factor dominates) may be done separately for each CC, theapplication of the procedure to determine whether to trigger PHR may bedone separately for each CC, and P-MPR,c may be used instead of P-MPR.

If the P-MPR was the dominating factor when the last PHR was sent andcontinues to be the dominating factor now (e.g., in this TTI), then itmay be useful to report the PHR for changes related to the P-MPR greaterthan a configured threshold. The WTRU 102 may apply the procedure fordetermining whether to trigger the PHR based on changes related to theP-MPR. If there are multiple CCs, each of these determinations (e.g., ofwhich factor dominates) may be done separately for each CC, theapplication of the procedure to determine whether to trigger PHR may bedone separately for each CC, and P-MPR,c may be used instead of P-MPR.

In certain representative embodiments, representative MAC procedures mayinclude a PHR trigger, which may use the lookback window.

For example, a prohibitPHR-Timer may be implemented. A PHR may bereported if the prohibitPHR-Timer expires or has expired or may expireor may have expired and the highest additional power backoff due topower management (as allowed by P-MPR) during the backoff window (e.g.,P-MPRbackoffWindow) for at least one activated Serving Cell withconfigured uplink has changed or may have changed more than a threshold(e.g., dl-PathlossChange dB) since the last transmission of a PHR whenthe WTRU 102 has or may have UL resources for new transmission.

The P-MPRbackoffWindow may specify the number of consecutive subframesduring which the WTRU 102 determines the highest additional powerbackoff due to power management (as allowed by P-MPR). Alternatively, aP-MPRbackoffWindow may specify the number of subframes during which theWTRU 102 may determine the highest additional power backoff due to powermanagement (as allowed by P-MPR). In a second alternative, theP-MPRbackoffWindow may specify the number of uplink subframes duringwhich the WTRU 102 may determine the highest additional power backoffdue to power management (as allowed by P-MPR). In a third alternative, aP-MPRbackoffWindow may specify the number of consecutive uplinksubframes during which the WTRU 102 may determine the highest additionalpower backoff due to power management (as allowed by P-MPR).

The Extended Power Headroom MAC Control Element (CE) may include aP_(CMAX,c) field which may be defined as follows. P_(CMAX,c): This fieldcontains or may include the P_(CMAX,c) used for calculation of thepreceding PH field. The calculation of P_(CMAX,c) takes into account ormay take into account the highest additional power backoff due to powermanagement (as allowed by P-MPR) during the P-MPRbackoffWindow.

The threshold used for comparison above, identified asdl-PathlossChange, may be a different configurable threshold such as onespecified for this purpose.

References 511-516 indicate various descriptions associated with FIG. 5.Reference 511 describes that PHR triggered based on Level C and thatLevel C reported. Reference 512 describes that PHR triggered based onLevel B even though level is lower at this moment and that Level Breported. Reference 513 describes a Pathloss trigger and that Level Breported (not the level of the drop). Reference 514 describes that PHRtriggered based on Level D and that Level D reported. Reference 515describes that PHR triggered based on Level B and that Level B reported.Reference 516 describes use of highest P-MPR in window.

FIG. 6 shows, for example, the use of a lookback window, for exampleP-MPRbackoffWindow. In this example, the P-MPR backoff trigger may bebased on the highest P-MPR value during a time period preceding thetrigger (e.g., P-MPRbackoffWindow).

Referring to FIG. 6, in representative triggering procedure 600, theWTRU 102 may monitor or determine the P-MPR, which may vary over time.At a first time 610, the PHR may be triggered based on the P-MPR beingmonitored (or determined) to be at level C and the P-MPR may be reportedto network resources (e.g., eNB 140) in the PHR. At the first time, aprohibit timer may be set for a specified period. During the specifiedperiod until the prohibit timer expires another PHR may be prohibitedfrom being triggered. A lookback window may be established to determinea condition associated with the P-MPR during the lookback window. Thecondition may include one or more of: (1) the highest value of P-MPR inthe lookback window; (2) the worst value of the P-MPR in the lookbackwindow; and/or (3) the lowest value of P-MPR in the lookback window;among many others previously described above. The WTRU 102 may determinea value associated with a current interval (e.g., current TTI) based onthe condition. For example, during a first interval (e.g., associatedwith a TTI) which may correspond to (for example begin at) a first time610, an associated lookback window (e.g., P-MPRbackoffWindow) may have ahighest P-MPR in the lookback window which is at level C. Based on thedetermination that the level C P-MPR value corresponds to the firstinterval, the WTRU 102 may determine that the P-MPR has changed morethan a threshold or the P-MPR dominates and/or other triggering criteriais satisfied and may send a PHR.

At a second time 620, after the prohibit timer has expired, and thelookback window no longer includes P-MPR values at level C, the highestP-MPR value in the lookback window associated with the second time 620is at level B. The WTRU 102 may trigger a PHR due to the change in P-MPRfrom level C to level B, for example because the P-MPR may no longerdominate or the change may be larger than a threshold. After eachtriggering event the prohibit timer may be set for a specified time.

At a third time 630, just after the prohibit timer expires, the value ofP-MPR may be at level B, having increased to level C for a short periodof time during the time when PHR was prohibited and then decreasing tolevel B. Based on level C which is the highest P-MPR value correspondingto the lookback window, the WTRU 102 may trigger a PHR due to P-MPRdominating and/or changing by a threshold amount (compared with thepreviously reported level B) and the WTRU 102 may report P-MPR level Cinstead of the actual level B. Another prohibit timer may be set for aspecified time.

At a fourth time 640, after the prohibit timer expires, the P-MPR valuemay be at level A and a pathloss trigger may occur and the WTRU 102 mayreport level C based on the highest P-MPR value corresponding to thelookback window instead of level A.

In certain representative embodiments, if the prohibitPHR-Timer is notrunning and the highest value of P-MPR backoff during theP-MPRbackoffWindow increases or decreases more than dl-PathLossChange dBsince the last PHR, PHR is triggered and this largest P-MPR backoffvalue is used in the P_(CMAX,c) calculation.

Certain representative procedures may restrict or prevent PHR triggeringwhen P-MPR backoff may decrease for a short time (for example, aspike-down in backoff which may result in a spike-up in allowed orconfigured maximum output power) while allowing for fast triggering whenthe P-MPR backoff increases (for example, a spike-up in backoff whichmay result in a spike-down in allowed or configured maximum outputpower). The representative procedures may ensure that the P_(CMAX,c)value for a PHR is not based on an occasional or temporary backoff value(e.g., low backoff value) to avoid scheduling grants that exceed theavailable WTRU transmit power.

In certain representative embodiments, representative procedures may beimplemented using modified Time-to-Trigger (TTT).

A TTT reporting delay may be applied when determining whether to triggerPHR when P-MPR (e.g., the amount of power management based backoff) isreduced by more than a threshold since the last PHR was sent. It iscontemplated that use of this delay may prevent excessive triggers dueto intermittent drops in P-MPR, but allow increases in P-MPR to triggerPHR without waiting (e.g., except for waiting due to the prohibittimer). Once the TTT timer is started, if the criteria (e.g., the P-MPRhaving dropped by more than a threshold) is met for the duration of theTTT timer, the PHR may be triggered when the TTT timer expires. The PHRmay be sent using the current value of P_(CMAX,c) for each CC at thetime of the PHR triggering.

The above procedure may not work as well in cases in which during theTTT time period, the P-MPR fluctuates while the drop in the P-MPRcontinues to be below a threshold. The PH report may use the P-MPR valuethat happens at the time of the trigger and that value may not berepresentative of the P-MPR. For example, if at the moment of TTTexpiration the P-MPR fluctuates down and the WTRU 102 sends a PHR basedon that P-MPR, then the eNB 140 may schedule UL grants using more powerthan available when the P-MPR fluctuates back up.

In certain representative embodiments, a modified version of the TTTprocedure may be implemented. The WTRU 102 may take one or more of thefollowing actions.

When the WTRU 102 triggers and reports the PHR as a result of reducedP-MPR TTT expiry, the WTRU 102 may use the highest P-MPR value (e.g.,the value resulting in the most power reduction) during a preceding timeperiod, which may be equal to, for example: (1) the TTT timer length;(2) the prohibit timer length, or (3) another window of time such as alookback window, in the calculation of the P_(CMAX,c) it uses for thePHR. The WTRU 102 may use the P-MPR value for the calculation of theP_(CMAX,c) value it reports for each CC in the PHR. The WTRU 102 may usethe P-MPR value for the calculation of the P_(CMAX,c) value it uses inthe computation of the PH it reports in the PHR for each CC. This may beapplicable to Type 1 (PUSCH) and/or Type 2 (PUSCH+PUCCH) PH. If thereare multiple CCs, the calculation may be done separately for each CC andthe P-MPR may be the P-MPR,c for each CC.

When the WTRU 102 triggers and reports PHR for another triggering eventsuch as a change in pathloss, reconfiguration, SCell activation, and/orperiodic PHR report, among others, the WTRU 102 may use the highestP-MPR value (e.g., the value resulting in the most power reduction),during a preceding time period, which may be equal to: (1) the TTT timerlength; (2) the prohibit timer length; or (3) another window of timesuch as a lookback window, in the calculation of the P_(CMAX,c) it usesfor the PHR. The WTRU 102 may use the P-MPR value for the calculation ofthe P_(CMAX,c) value it reports for each CC in the PHR. The WTRU 102 mayuse the P-MPR value for the calculation of the P_(CMAX,c) value it usesin the computation of the PH it reports in the PHR for each CC. This maybe applicable to Type 1 (PUSCH) and/or Type 2 (PUSCH+PUCCH) PH. If thereare multiple CCs, the calculation may be done separately for each CC andthe P-MPR may be P-MPR,c for each CC.

As an alternative to using the highest P-MPR value in the window, theWTRU 102 may use another value in the window or a value computed basedon the values in the window, such as an average value, median value orthese values excluding extreme high or low values over a preceding timeperiod.

As an alternative to (or in addition to) using a drop in the P-MPR sincethe last PHR being greater than a threshold, as the criteria forinitiating the TTT, the WTRU 102 may use the change, such as an increaseor a decrease, in impact of P-MPR on the P_(CMAX) or the P_(CMAX,c)since the last PHR being greater than a threshold, as the criteria forinitiating the TTT. If there are multiple CCs, this may be doneseparately for each CC. The P-MPR may be P-MPR,c for each CC. The WTRU102 may initiate the TTT if the criteria is met for at least one CC.

As an alternative to (or in addition to) maintaining a drop in the P-MPRsince the last PHR that is greater than a threshold for the duration ofthe TTT time, as the criteria for triggering the PHR, the WTRU 102 mayuse maintaining a change, such as an increase or a decrease in impact ofthe P-MPR on P_(CMAX) or P_(CMAX,c) since the last PHR that is greaterthan a threshold as the criteria for triggering the PHR. If there aremultiple CCs, this may be done separately for each CC. The P-MPR may beP-MPR,c for each CC. The WTRU 102 may trigger the PHR if the criteria ismet for at least one CC.

As an alternative to (or in addition to) using a drop in the P-MPR sincethe last PHR being greater than a threshold, as the criteria forinitiating the TTT, the WTRU 102 may use the increase in the P_(CMAX) orthe P_(CMAX,c) since the last PHR being greater than a threshold, as thecriteria for initiating the TTT. If there are multiple CCs, this may bedone separately for each CC. The P-MPR may be the P-MPR,c for each CC.The WTRU 102 may initiate the TTT if the criteria is met for at leastone CC.

As an alternative to (or in addition to) maintaining a drop in the P-MPRsince the last PHR that is greater than a threshold for the duration ofthe TTT time, as the criteria for triggering the PHR, the WTRU 102 mayuse maintaining an increase in the P_(CMAX) or the P_(CMAX,c) since thelast PHR that is greater than a threshold, as the criteria fortriggering the PHR. If there are multiple CCs, this may be doneseparately for each CC. The P-MPR may be the P-MPR,c for each CC. TheWTRU 102 may trigger PHR if the criteria is met for at least one CC.

The WTRU 102 may use the chosen the P-MPR (or PMPR,c) value or values inits power calculations (for example PH and/or P_(CMAX) and/or P_(CMAX,c)calculations) as described previously regarding, for example, thelookback windows and as described later.

References 611-615 indicate various descriptions associated with FIG. 6.Reference 611 describes that PHR triggered based on Level C and thatLevel C reported. Reference 612 describes that PHR triggered based onLevel B even though level is lower at this moment and that Level Breported. Reference 613 describes that PHR triggered based on Level Cand that Level C reported. Reference 614 describes a Pathloss triggerand that Level C reported (not the level of the drop). Reference 615describes use of highest P-MPR in window.

FIG. 7 is a diagram illustrating a representative triggering procedure700 using a modified TTT for the PHR.

In certain representative procedures reporting P-MPR or a level of P-MPR(for example P-MPR level X) may be equivalent to including in a PHRP_(CMAX,c) which may include or account for P-MPR backoff which may beat, of, or have a value of level X

Referring to FIG. 7, in the representative triggering procedure 700, theWTRU 102 may monitor or determine the P-MPR, which may vary over time.At a first time 710, the PHR may be triggered based on the P-MPR beingmonitored (or determined) to be at level C and the P-MPR may be reportedto network resources (e.g., eNB 140) in the PHR. At the first time 710,a prohibit timer may be set for a specified period. During the specifiedperiod until the prohibit timer expires another PHR may be prohibitedfrom being triggered.

At a second time 720, the P-MPR value may drop from level C to level Aand that may start the TTT timer. At a third time 730, the P-MPR mayincrease from level A to level C and the TTT timer may be stopped.Because the TTT timer may not have expired, no PHR trigger occurs. At afourth time 740, the P-MPR value may drop from level C to level A whichmay start the TTT timer. The P-MPR may vary (e.g., be bursty) betweenlevels A and B for the duration of the TTT time (e.g., which may notstop the TTT timer because the change in P-MPR may not exceed athreshold). Responsive to the TTT timer expiring, at a fifth time 750,the WTRU may trigger the PHR reporting and include in the PHR, the levelof the P-MPR at, for example, the highest level in the P-MPR TTT window(e.g., level B) and a prohibit timer may be set for a specified period.At a sixth time 760, the TTT timer may start (e.g., based on a drop inthe P-MPR value from level B to below level A).

At a seventh time 770, after the prohibit timer expires, the level ofthe P-MPR was maintained at below level A. The WTRU 102 may trigger aPHR for a reason other than P-MPR such as a significant pathloss changeand may report P-MPR at the level associated with a value (for example,a highest value, e.g., level B) associated with a lookback window forthe seventh time 770. The TTT timer may also be stopped, responsive tothe pathloss trigger and a prohibit timer may be set for a specifiedperiod.

At an eighth time 780, after the prohibit timer expires, the level ofthe P-MPR has changed to a level between levels C and D such that a PHRmay be triggered reporting a P-MPR level D based on the value (e.g.,highest value) associated with the corresponding lookback window. It iscontemplated that the drops associated with the downward spikes in theP-MPR value after the eighth time 780 do not exceed the threshold forstarting the TTT timer. At the eighth time 780 a prohibit timer may beset for a specified period

At a ninth time 790, which is after the prohibit timer expires, thelevel of the P-MPR has changed from the level D to a level B such thatthe TTT timer may start and at a tenth time 795, a PHR may be triggeredreporting P-MPR level B based on the value (e.g., highest value)associated with the corresponding P-MPR TTT window.

Variations on the representative procedure above may include one or moreof the following.

The WTRU 102 may first determine whether changes related to the P-MPRmay be used as triggering criteria. The determination may be based onwhether or not the P-MPR is the dominating factor in (e.g., whether ithas an effect on) the calculation of P_(CMAX) (or P_(CMAX,c)). If thereare multiple CCs, each of the determinations may be done separately foreach CC.

If the P-MPR was not the dominating factor when the last PHR was sentand is not the dominating factor now (e.g., in this TTI), then it maynot be useful to report the PHR for changes related to the P-MPR and theWTRU 102 may skip the procedure for determining whether to trigger thePHR based on changes related to the P-MPR. If there are multiple CCs,each of these determinations (e.g., of which factor dominates or whetherto trigger PHR) may be done separately for each CC. The WTRU 102 mayskip the procedure for determining whether to trigger the PHR based onchanges related to the P-MPR for any CC for which the conditions aretrue (e.g., for any CC for which the P-MPR, or P-MPR,c, was not thedominating factor when the last PHR was sent and is not the dominatingfactor now).

If the P-MPR was not the dominating factor when the last PHR was sentand is not the dominating factor now (e.g., in this TTI), then it maynot be useful to report the PHR for changes related to the P-MPR and theWTRU 102 may skip the procedure for initiating the TTT timer based onchanges related to P-MPR. If there are multiple CCs, each of thesedeterminations (e.g., of which factor dominates or whether to initiatethe TTT timer) may be done separately for each CC. The WTRU 102 may skipthe procedure for initiating the TTT timer based on changes related tothe P-MPR (or the P-MPR,c) for any CC for which the conditions are true(e.g., for any CC for which the P-MPR, or P-MPR,c, was not thedominating factor when the last PHR was sent and is not the dominatingfactor now).

In certain representative embodiments, the chosen P-MPR may be used bythe WTRU 102 in its power calculations.

The WTRU 102 may choose a P-MPR value to use in the calculation of PHand/or P_(CMAX,c) for the PHR (e.g., the P_(CMAX,c) to be included inthe PHR) that is not the actual power management power backoff (e.g.,backoff needed). The WTRU 102 may use a P-MPR backoff value in its powercontrol computations in one or more of the following ways where theP-MPR may be replaced by the P-MPR,c in the case of multiple CCs.

In a given subframe, if the actual power management power backoff (e.g.,backoff needed) is less than or equal to the P-MPR backoff value chosenfor the last PHR (or the current PHR, if a PHR may be sent in thissubframe), the WTRU 102 may use the chosen P-MPR as the power managementpower backoff value when computing P_(CMAX,c) for the UL power control.The WTRU 102 may, alternatively, use the actual power management powerbackoff (e.g., backoff needed) when computing P_(CMAX,c) for the ULpower control. In the case of maximum power conditions, this (e.g., useof the actual backoff) may avoid unnecessary power clipping or scalingdue to an unnecessarily high P-MPR.

In a given subframe, if the actual power management power backoff (e.g.,backoff needed) is greater than the P-MPR backoff value chosen for thelast PHR (or the current PHR, if a PHR may be sent in this subframe),the WTRU 102 may use this value, as the P-MPR value, when computing theP_(CMAX,c) for the power control. The WTRU 102 may, alternatively, usethe actual power management power backoff (e.g., backoff needed) whencomputing the P_(CMAX,c) for the UL power control. This may beadvantageous for sustained higher actual P-MPR which cannot be reportedfor some reason such as an active prohibit timer.

In certain representative embodiments, a triggering procedure may beimplemented for triggering the PHR based on which factor dominates inthe calculation of the P_(CMAX) and the P_(CMAX,c).

In some cases, the P-MPR (or the P-MPR,c) may have an impact on thecalculation of the P_(CMAX) and/or the P_(CMAX,c) and in some casesit/they may not. This is also referred to as whether the P-MPR (or theP-MPR,c) dominates the value of P_(CMAX) and/or P_(CMAX,c). It iscontemplated that even when the P-MPR (or the P-MPR,c) is at a non-zerovalue, the value of P_(CMAX) and/or P_(CMAX,c) may be unaffected if theP-MPR (or the P-MPR,c) is not dominating the calculation. The P_(CMAX)may be the configured maximum output power for the WTRU 102. TheP_(CMAX,c) may be the configured maximum output power for a given CC.Example procedures for triggering the PHR based on which factordominates in the calculation of the P_(CMAX) and/or the P_(CMAX,c) areprovided.

Although specific elements of these representative procedures aredescribed either individually or in certain combinations, it iscontemplated that they may also be used in any combination with otherelements described herein.

In certain representative embodiments, example procedures may beimplemented in which the PHR is triggered when there is a change inwhich factor dominates the P_(CMAX,c) calculation.

The WTRU 102 may take one or more of the following actions. The WTRU 102may trigger the PHR when the P-MPR dominates (e.g., in the current TTI)the calculation of the P_(CMAX,c) (or the P_(CMAX)), and did notdominate the calculation of the P_(CMAX,c) (or the P_(CMAX)) in the lastPHR. For multiple CCs, the WTRU 102 may trigger the PHR, if for any oneor more CCs there is a change from the P-MPR not dominating in the lastPHR to the P-MPR dominating (e.g., in the current TTI). For multipleCCs, the P-MPR may be CC specific, P-MPR,c for each CC. One or more ofthe prohibit, TTT, or lookback timers or windows may be used to excludeor delay the P-MPR domination triggering.

The WTRU 102 may trigger the PHR, when P-MPR does not dominate (e.g., inthe current TTI) the calculation of the P_(CMAX,c) (or the P_(CMAX)),and dominated the calculation of the P_(CMAX,c) (or the P_(CMAX)) in thelast PHR. For multiple CCs, the WTRU 102 may trigger PHR, if for any oneor more CCs there is a change from the P-MPR dominating in the last PHRto the P-MPR not dominating (e.g., in the current TTI). For multipleCCs, the P-MPR may be CC specific, P-MPR,c for each CC. One or more ofthe prohibit, TTT, or lookback timers or windows may be used to excludeor delay the P-MPR domination triggering.

In certain representative embodiments, the WTRU 102 may determine if PHRtriggering criteria has been satisfied as follows. The PHR triggeringcriteria may be satisfied, if the P-MPR was not the dominatingP_(CMAX,c) (or P_(CMAX)) factor in the last PHR, and is now thedominating factor and/or if the P-MPR was the dominating P_(CMAX,c) (orP_(CMAX)) factor in the last PHR, and now is not the dominating factor.

The following calculation of the P_(CMAX,c) may be used as an example tohelp illustrate the procedure:

P _(CMAX,c)(i)=MIN{P _(EMAX,c) −ΔT _(C,c) ,P_(PowerClass)−MAX(MPR_(actual,c),P-MPR,c(i))−ΔT _(C,c)}  Equation (101)

In this example, P-MPR,c may affect the value of P_(CMAX,c) whenP-MPR,c>MPRactual,c and [P_(PowerClass)−P-MPR,c]<P_(EMAX,c)

When the P-MPR (used generically to represent the P-MPR or the P-MPR,c)does not dominate the calculation of the P_(CMAX,c), the eNB 140 may beable to track changes in the MPR and other related factors (e.g., LTErelated factors) affecting the P_(CMAX,c) based on information it mayhave, may receive, or may control such as the P_(CMAX,c) values reportedin the PHR and the UL grants the eNB 140 may provide for each CC of theWTRU 102.

When the P-MPR dominates, a PHR may provide the eNB 140 with theP_(CMAX,c) value. Using the example equation,P_(CMAX,c)=P_(PowerClass)−P-MPR,c(i)−ΔT_(C,c) when the P-MPR dominates,if the eNB 140 knows that P-MPR is dominating (such as by an indicationthat the P-MPR is dominating included in the PHR as described herein),the eNB 140 may be able to determine the power management power backoffused by the WTRU 102.

References 711-719 indicate various descriptions associated with FIG. 7.Reference 711 describes that PHR triggered based on Level C and thatLevel C reported. Reference 712 describes that PHR triggered based onLevel B even though level is lower at this moment and that Level Breported. Reference 713 describes a Pathloss trigger and that Level Breported (not the level of the drop) and that the highest value inlookback window is used. Reference 714 describes that PHR triggeredbased on Level D and that Level D reported. Reference 715 describes thatPHR triggered based on Level B and that Level B reported. Reference 716describes the use of highest P-MPR in TTT time. References 717 and 718describe the use of highest P-MPR in lookback time. Reference 719describes that the drops are not big enough to start timer and if theywere, would start and stop in this time (prior to start of TTT timer).

FIG. 8 is a diagram illustrating representative triggering and PHRprocedure 800 relating to additional power backoff domination.

Referring to FIG. 8, in the representative triggering and PHR procedure800, at a first time 810, any trigger may have occurred (e.g., a triggerdue to a significant pathloss change). The WTRU 102 may send a PHR tothe eNB 140 which may include PH for the active CCs and may also includeP_(CMAX,c) for the CCs. The WTRU 102 may also send an indication (e.g.,included in the PHR) for each CC as to whether the P-MPR is affectingthe calculation of the P_(CMAX,c). The prohibit timer may be set, inresponse to the trigger. Until the next PHR, the eNB 140 may track theMPR (which may include MPR and/or A-MPR) and estimate the PH since theMPR dominates the calculation of P_(CMAX,c). At a second time 820, afterthe prohibit timer expires, the P-MPR value may change in value (e.g.,an increase) greater than a threshold amount and the P-MPR may dominatethe calculation of P_(CMAX,c). The WTRU 102 may trigger the PHR due tothe change in P-MPR. The eNB 140 may determine the P-MPR (which is atlevel B at time 820) from the PHR (e.g., from the P_(CMAX,c)). At athird time 830, after the prohibit timer expires, the P-MPR value maychange in value (e.g., an increase) greater than a threshold amount andthe MPR may have also changed (e.g., increased) and may dominate thecalculation of P_(CMAX,c). The WTRU 102 may trigger the PHR due to thechange in P-MPR. The eNB 140 may no longer be able to determine theP-MPR (which is at level C at time 830) from the PHR (e.g., from theP_(CMAX,c)) since the MPR dominates the calculation of P_(CMAX,c) attime 830.

At a fourth time 840, after the prohibit timer expires, the MPR valuemay change in value (e.g., decrease) such that the P-MPR now maydominate the calculation of P_(CMAX,c). The WTRU 102 may trigger the PHRreport due to the change in domination. The eNB 140 may now determinethe P-MPR (which is at level C at time 840) from the PHR. Without thistrigger, the eNB 140 may not know the P-MPR and may over schedule theWTRU 102.

In certain representative embodiments, a PHR trigger may be implementedwhen the P_(CMAX,c) (or P_(CMAX)) dominating factor changes. Forexample, the trigger may be implemented when the dominating factor ofthe P_(CMAX,c) changes from the P-MPR not dominating to the P-MPRdominating. The trigger associated with the first time 810 may be anyPHR trigger such as a trigger due to a pathloss change greater than athreshold. As a result of the trigger, the WTRU 102 may send a PHRincluding PH values for the active CCs along with the P_(CMAX,c) valuesfor the CCs. The WTRU 102 may also send an indication (e.g., included inthe PHR) for each CC as to whether the P-MPR is affecting thecalculation of P_(CMAX,c). In this case, P-MPR is not dominating. Untilthe next PHR, as long as the P-MPR continues not to dominate, the eNB140 may schedule UL grants as if the P-MPR did not exist. If the eNB 140tracks the MPR, the A-MPR, etc, it may estimate power headroom that itmay use in its scheduling decisions.

The trigger associated with the second time 820 in this example may bedue to a large change in P-MPR, (e.g., a change in P-MPR since the lastPHR that is greater than a threshold). As a result of the trigger, theWTRU 102 may send a PHR including PH values for the active CCs alongwith the P_(CMAX,c) values for the CCs. The WTRU 102 may also send anindication (e.g., included in the PHR) for each CC as to whether theP-MPR is affecting the calculation of P_(CMAX,c). In this case, theP-MPR is dominating. Having P_(CMAX,c) and an indication that P-MPR isdominating may enable the eNB 140 to determine the P-MPR value (e.g.,level B) used by the WTRU 102.

Until the next PHR, if the eNB 140 tracks the MPR, the A-MPR, etc., itmay compare the appropriate values with the P-MPR value to determinewhich is dominating and use either the tracked values or the P-MPR valueto estimate PH, accordingly. This may be possible because the P-MPR maybe known from the last PHR.

The trigger associated with the third time 830 in this example may bedue to a large change in the P-MPR, (e.g., a change in P-MPR since thelast PHR that is greater than a threshold). As a result of the trigger,the WTRU 102 may send a PHR including the PH values for the active CCsalong with the P_(CMAX,c) values for the CCs. The WTRU 102 may also sendan indication (e.g., included in the PHR) for each CC as to whether theP-MPR is affecting the calculation of the P_(CMAX,c). In this case, theP-MPR is not dominating. The eNB 140 now knows that the P-MPR no longerdominates, and because the P-MPR is not dominating, it cannot determinethe current P-MPR value even though it changed significantly (e.g., bygreater than a threshold amount).

Until the next PHR, as long as the P-MPR continues not to dominate, theeNB 140 may schedule the UL grants as if the P-MPR did not exist. If theeNB 140 tracks the MPR, the A-MPR, etc, it can estimate power headroomthat it may use in its scheduling decisions.

If the situation changes and the P-MPR dominates, without a large changethat may trigger a PHR, the eNB 140 may have no way of knowing that theP-MPR is dominating or the P-MPR value. The eNB 140 may over schedulethe WTRU 102, which may result in power scaling at the WTRU 102.

At the fourth time 840, a trigger may be useful, due to the change tothe P-MPR dominating from the P-MPR not dominating in the last PHR, toinform the eNB 140 that the P-MPR is now dominating and provide theP_(CMAX,c) values which may enable the determination of the P-MPR.

Similar to the time between the second and third triggers associatedwith times 820 and 830, until the next PHR, if the eNB 140 tracks theMPR, the A-MPR, etc., it may compare the appropriate values with theP-MPR value to determine which is dominating and may use either thetracked values or the P-MPR value to estimate the PH, accordingly.

References 811-819 indicate various descriptions associated with FIG. 8.Reference 811 describes any trigger (trigger1) (e.g., pathloss) and thatMPR dominates. Reference 812 describes a PHR trigger due to large changein P-MPR, that P-MPR dominates, that P_(CMAX,c) uses Level B, and thatthe eNB can determine P-MPR. Reference 813 describes a PHR trigger dueto large change in P-MPR, that MPR dominates, and that the eNB no longerknows what P-MPR is. Reference 814 describes a PHR trigger due to changefrom P-MPR not dominating to P-MPR dominating, P_(CMAX,c), uses Level C,and that the eNB can determine P-MPR. Reference 815 describes that theeNB can track MPR and estimate PH since MPR dominates. Reference 816describes that the eNB can track MPR based on scheduling, that the eNBknows what P-MPR was from last PHR, that the eNB can figure out when MPRdominates and when P-MPR dominates and that the eNB can estimate PH.Reference 817 describes that the eNB can track MPR. eNB can estimate PHas long as MPR dominates. Reference 818 describes that the eNB can trackMPR, that the eNB knows what P-MPR was from last PHR, that the eNB canfigure out when MPR dominates and when P-MPR dominates and that the eNBcan estimate PH. Reference 819 describes that without Trigger 4, the eNBwould not know when P-MPR is dominating (since it does not know P-MPR)and may overschedule.

FIG. 9 is a diagram illustrating representative triggering and PHRprocedure 900.

Referring to FIG. 9, in the representative triggering and PHR procedure900, at a first time 910, any trigger may have occurred (e.g., a triggerdue to a significant pathloss change). The WTRU 102 may send a PHR tothe eNB 140 which may include PH for the active CCs and may also includeP_(CMAX,c) for the CCs. The WTRU 102 may also send an indication (e.g.,included in the PHR) for each CC as to whether the P-MPR is affectingthe calculation of the P_(CMAX,c). The prohibit timer may be set, inresponse to the trigger. Until the next PHR, the eNB 140 may track theMPR (which may include MPR and/or A-MPR) and estimate the PH since theMPR dominates the calculation of P_(CMAX,c). At a second time 920, afterthe prohibit timer expires, the P-MPR value may change in value (e.g.,an increase) greater than a threshold amount and the P-MPR may dominatethe calculation of P_(CMAX,c). The WTRU 102 may trigger the PHR due tothe change in P-MPR. The eNB 140 may determine the P-MPR (which is atlevel C at time 920) from the PHR (e.g., from the P_(CMAX,c)). At athird time 930, after the prohibit timer expires, the P-MPR value maychange in value (e.g., a decrease) greater than a threshold amount andat that time the MPR may dominate the calculation of P_(CMAX,c). TheWTRU 102 may trigger the PHR due to the change in P-MPR. The eNB 140 mayno longer be able to determine the P-MPR (which is at level B at time930) from the PHR (e.g., from the P_(CMAX,c)) since the MPR dominatesthe calculation of P_(CMAX,c) at time 930.

At a fourth time 940, after the prohibit timer expires, the MPR valuemay change in value (e.g., decrease) such that the P-MPR now maydominate the calculation of P_(CMAX,c). The WTRU 102 may trigger the PHRreport due to the change in domination. The eNB 140 may now determinethe P-MPR (which is at level B at time 940) from the PHR. Without thistrigger, the eNB 140 may not know that the P-MPR is dominating and mayincorrectly schedule the WTRU 102.

In certain representative embodiments, if the trigger at the fourth timedid not exist, the eNB 140 may assume that P-MPR is the same as it waswhen the trigger at the second time occurred. In this case, when the eNB140 assumes the P-MPR is dominating, it may under schedule the WTRU 102since it may assume level C continued. In other representativeembodiments, if the eNB 140 assumes that the MPR is dominating (e.g.,always dominating) since the last PHR indicated the MPR was dominating,then the eNB 140 may over schedule the WTRU 102 when the P-MPR doesindeed dominate.

In certain representative embodiments, procedures (e.g., MAC procedures)may include a PHR trigger based on a change in P_(CMAX,c) domination. Arepresentative example PHR trigger based on P_(CMAX,c) domination may bedefined to occur when a prohibitPHR-Timer expires or has expired or mayexpire or may have expired and a field (e.g., a domination indicationfield or a P field) in the PHR (e.g., the MAC PHR) which may indicatethat P_(CMAX,c) would have had (or may have had) a different value if noadditional power management had been applied has changed (or may havechanged) since the last transmission of a PHR when the WTRU 102 has ormay have UL resources for new transmission.

In certain representative embodiments, a determination of whether totrigger a PHR may include the use of a dominating factor.

The WTRU 102 may determine if and on what basis to trigger PHR based onone or more of the following representative procedures. The WTRU 102 maydetermine whether changes related to the P-MPR may be used as triggeringcriteria. This determination may be based on whether or not the P-MPR isthe dominating factor in (e.g., whether it has an effect on) thecalculation of the P_(CMAX,c) (or the P_(CMAX)). If there are multipleCCs, each of these determinations may be done separately for each CC.The P-MPR may be the P-MPR,c for each CC.

If the P-MPR was not the dominating factor when the last PHR was sentand is not the dominating factor now (e.g., in the current TTI), then itmay not be useful to report the PHR for changes related to the P-MPR(e.g., when the P-MPR changes by more than a threshold). The WTRU 102may skip the procedure for determining whether to trigger the PHR basedon changes related to the P-MPR. If there are multiple CCs, each ofthese determinations (e.g., which factor dominates or whether to triggerPHR) may be done separately for each CC. The WTRU 102 may skip theprocedure for determining whether to trigger the PHR based on changesrelated to the P-MPR for any CC for which the conditions are true (e.g.,for any CC for which the P-MPR, or P-MPR,c, was not the dominatingfactor when the last PHR was sent and is not the dominating factor now).The P-MPR may be the P-MPR,c for each CC.

In certain representative embodiments, the P_(CMAX) value in the PHR maysupport inter-band UL transmission. It is contemplated that the CC andthe serving cell may be used interchangeably and the TTI may besubstituted for the subframe and still be consistent with theseembodiments.

The P_(CMAX) may be the WTRU's total configured maximum output power. Ifthe sum of the WTRU 102 computed powers for the UL CCs without scalingwould or is to exceed the P_(CMAX), the WTRU 102 may scale the CC powersbefore transmission to avoid exceeding its maximum power. Sending theP_(CMAX) in the PHR may be useful to the eNB scheduler to enable the eNBscheduler to determine if the WTRU 102 scaled CC powers and, if so, byhow much. It is contemplated that for the case of intra-band UL, the eNB140 may be able to determine or estimate the P_(CMAX) from theP_(CMAX,c) and may not be able to determine or estimate the P_(CMAX)from the P_(CMAX,c) for inter-band UL.

In certain representative embodiments, P_(CMAX) may be sent by the WTRU102 in the PHR (e.g., always including P_(CMAX) in the PHR or includingit in an Extended PHR report, for example only for Release 11 and/orlater Release WTRUs 102). If the WTRU 102 is always sending P_(CMAX) inthe PHR, unnecessary or not useful signaling may occur when P_(CMAX) maybe determined based on other signaled parameters. It may be useful tosend (e.g., only send) P_(CMAX) in the PHR when it is useful or neededwhich may reduce signaling overhead.

The following are representative procedures for reducing the PHRsignaling by including P_(CMAX) in the PHR when (e.g., only when)certain criteria are met.

The WTRU 102 may include the P_(CMAX) in the PHR, which may be in theExtended PHR MAC CE, based on one or more of the following criteriabeing met (or satisfied).

A first criteria may include a configuration criteria, which may besatisfied if the WTRU 102 is configured for inter-band UL (e.g., theWTRU 102 is configured with at least one UL CC in each of at least twobands, for example 800 MHz band and 2.1 GHz band).

A second criteria may include an activated/CC criteria, which may besatisfied if the PHR includes (or will or is to include) reports for CCsin at least two bands which may, for example, mean that, or be such that(1) there may be at least one activated CC in each of at least two bandsfor which a PH is included (or will be or is to be included) in the PHRand the PH for each of those CCs may be real or virtual; and/or (2)there may be at least one CC in each of at least two bands for which thePH is included (or will be or is to be included) in the PHR and the PHfor each of those CCs may be real or virtual, among others.

A third criteria may include a real PH criteria, which may be satisfiedif the PHR includes (or will or is to include) real PH for CCs in atleast two bands which may, for example mean that, or be such that (1) aV-bit may indicate real PH for at least one CC in each of at least 2bands; and/or (2) the P_(CMAX,c) may be (or will be or is to be)included in the PHR for at least one CC in each of at least 2 bands;and/or (3) for at least one CC in each of at least 2 bands, there may beUL resources (e.g., PUSCH and/or PUCCH) in the subframe for which (or inwhich) the PHR is being reported; and/or (4) for at least one CC in eachof at least 2 bands, there may be UL resources allocated in the subframefor which (or in which) the PHR is being reported where UL resources maybe allocated by UL grant or by configured Semi-Persistent Scheduling(SPS) and such allocations may result in a PUSCH transmission; and/or(5) for at least one CC in each of at least 2 bands, there may be ULresources allocated or a PUCCH transmission in the subframe for which(or in which) the PHR is being reported where UL resources may beallocated by UL grant or by configured SPS and may result in a PUSCHtransmission, among others.

A fourth criteria may include a scaling criteria, which may be satisfiedif in the subframe for which (or in which) the PHR is being reported,the WTRU 102 scales or may scale one or more of the CC (or CC channel)powers it computed, for example, because the sum of the CC computedpowers would or is to exceed the overall allowed power for the WTRU 102,which may be the WTRU total configured maximum output power, P_(CMAX).

It is contemplated that the third criteria may be a subset of the secondcriteria and the second criteria may be a subset of the first criteriafor the case in which a CC with real PH is also an activated CC and anactivated CC is also a configured CC. In this case, non-redundantcriteria may include each of the first, second, third, and fourthcriteria alone and the combinations of the first and fourth, second andfourth, and third and fourth criteria, for example.

The following are examples of how a WTRU 102 may determine whether toinclude the P_(CMAX) in the PHR the WTRU 102 may send, and how an eNB140 may determine if the P_(CMAX) is present in a PHR the eNB 140 mayreceive.

In certain representative examples, the WTRU 102 may include (e.g., onlyinclude) the P_(CMAX) in the PHR if both the third criteria and thefourth criteria are met such that in the subframe of the PHR, there isat least one CC in each of at least 2 bands for which a real PH is beingincluded in the PHR and the WTRU 102 performed scaling to not exceed itsmaximum power, (e.g., which may be P_(CMAX)).

In other representative examples, the WTRU 102 may include (e.g., onlyinclude) the P_(CMAX) in the PHR if the second criteria is met such thatin the subframe of the PHR, there is (e.g., based on what the WTRU 102knows or determines) at least one activated CC in each of at least 2bands and for each of those CCs the reported PH may be real or virtual.

In further representative examples, since the PHR may include a bitmapindicating the CCs which are both configured and activated and for whichthe PH is included, and the eNB 140 knows which CCs are in each band(e.g., since the eNB 140 may configure the CCs), the eNB 140 may use thePHR MAC-CE bitmap which may identify for which CCs the PH is included todetermine whether the PH is included for CCs in more than one band. Ifthe criteria for including the P_(CMAX) is the second criteria, the eNB140 may know enough information to determine if the P_(CMAX) is presentin the PHR.

In yet other representative examples, the eNB 140 may use the bitmap todetermine which CCs may be included in the PHR and the V-bit associatedwith each PH to determine which CCs have real PH to determine whetherthere are real PH values for CCs in different bands in the PHR. If thecriteria for including P_(CMAX) is the third criteria, which may be met(e.g., may only be met) if the first and second criteria are also met,if the eNB 140 finds V-bits indicating real PH for CCs in each of atleast two different bands, the eNB 140 may have enough information(e.g., from the V-bits) to determine if the P_(CMAX) is present in thePHR.

If the criteria for including P_(CMAX) is the fourth criteria alone orcombined with any of the other criteria, the eNB 140 may not havesufficient information to determine if the P_(CMAX) is included in thePHR.

In certain representative embodiments, the WTRU 102 may include one ormore of the following in the PHR.

(1) An indication as to whether the WTRU 102 performed scaling whencomputing output power, which may provide an indication as to whetherthe WTRU 102 scaled one or more of the computed CC (or CC channel)powers, (e.g., to avoid the situation of exceeding the WTRU maximumallowed transmit power that may be the WTRU total configured maximumoutput power, P_(CMAX)). The indication may be a bit and may use areserved (or unused) bit in the MAC CE such as the reserved bit in thefirst octet of the PHR that identifies 7 of the bits to be used forindicating CCs included in the PHR and one bit as a reserved bit. Theindication, e.g., bit, may be used to indicate if the P_(CMAX) ispresent in the PHR. For example if the criteria for including theP_(CMAX) is the third and fourth criteria, the eNB 140 may use thebitmap indicating the CCs to know if there are CCs in the PHR that arein different bands, the V-bits to determine if the PH for CCs in atleast 2 bands are real, and the scaling bit to know if scaling occurred.If all of these criteria are met, the eNB 140 may expect the P_(CMAX) inthe headroom. The WTRU 102 may set the indication, e.g., the bit, to thestate indicating scaling whenever the WTRU 102 performed scaling in thesubframe for which (or in which) the PHR is sent. The WTRU 102 may setthe indication, e.g., the bit, to the state indicating scaling (and/orthe P_(CMAX) included) when one or more criteria for including theP_(CMAX) has been met and the WTRU 102 performed scaling in the subframefor which (or in which) the PHR is sent.

-   -   (2) An indication as to whether the P_(CMAX) is included in the        PHR, e.g., a presence indicator, for example which may be a        single bit in the PHR and may be in addition to (or in lieu of)        the scaling indication. The presence indication may use a        reserved (or unused) bit in the MAC CE such as the reserved bit        in the first octet of the PHR that identifies 7 of the bits to        be used for indicating CCs included in the PHR and a reserved        8th bit. The WTRU 102 may set the bit to indicate that P_(CMAX)        is present when the appropriate criteria such as one or more of        those described above are met.

Although providing an indication of P_(CMAX) in the PHR is disclosed forinter-band type operations, it is contemplated that it may be used forother situations than inter-band, such as non-contiguous intra-band oreven contiguous intra-band CA, and may provide useful information. Oneor more of the criteria for including the P_(CMAX) (e.g., which arebased on having CCs in multiple bands) may be applied in the case ofnon-contiguous intra-band and/or contiguous intra-band operations.Criteria relating to CCs in different bands may be extended to criteriarelating to CCs in different scenarios of other types such as CCs withdifferent carrier frequencies, for example in the case of non-contiguousintra-band CA or CCs which are non-colocated serving cells, amongothers.

In other representative embodiments, radio link monitoring (RLM) may beperformed (e.g., only performed) on the PCell, which may be sufficientfor intra-band operation and for serving cells which are co-located(e.g., since in these cases reception quality may be similar for suchcells). Performing RLM only for the PCell may not be sufficient forinter-band operation, for example, with inter-band DL and/or ULscenarios, or for the case in which cells such as those with remoteradio heads (RRH) may not be co-located. RLM may be extended to SCells.The RLM may be used to determine the quality of the DL reception thatmay result in detection of in-sync/out-of-sync condition.

In certain representative embodiments, the RLM (or some othermeasurement or mechanism) may be used to determine if the pathlossmeasurements being made on a DL CC being used as a pathloss referencefor an UL CC are of good quality and/or reliable.

If a pathloss reference is determined to be of poor quality (e.g., basedon some criteria), the WTRU 102 may take one or more of the followingactions. The WTRU 102 may report the problem (e.g., poor quality) in thePHR, (e.g., include a quality indicator for each CC or group of CCswhere the group may be based on a band, a location (e.g., RRH), or aTiming Advance (TA) (e.g., TA group). The WTRU 102 may disable the PHtriggers for a CC whose pathloss reference is poor quality (e.g., basedon the RLM procedures of the associated CC or group of CC's).

In certain representative embodiments, the following events may triggerthe PHR: (1) a pathloss change (e.g., exceeding a threshold and/or asignificant pathloss change) on one or more CCs (e.g., any CC) used as apathloss reference; (2) a P-MPR change (e.g., exceeding a thresholdand/or a significant P-MPR change) on one or more CCs (e.g., any CC);(3) a periodic timer expires; (4) a configuration/reconfiguration of thePHR function; and/or (5) an activation of an SCell with a configured UL,among others.

When operating with co-located intra-band cells, fading in each cell maybe correlated with that in other cells and the P-MPR may be the same forthe cells, so the cells may operate in a similar fashion. If thepathloss or the P-MPR changes (e.g., significantly) for one CC, it iscontemplated to change similarly for another. When a trigger criteria ismet and the PHR is sent for CCs (e.g., all CCs) it may include thechanges for CCs (e.g., all CCs) and may prohibit the PHR on CCs (e.g.,all CCs) for a period of time. Treating CCs (e.g., all CCs) similarlymay be reasonable for co-located intra-band cells since they may operatein a similar fashion.

When cells may be in different bands or different locations, thepathloss and the P-MPR for those cells may be uncorrelated. In thiscase, when triggering the PHR based on criteria being met for one CC, itmay or may not be that the trigger criteria is met for another CC inanother band or location. If the PHR is sent as a result of meeting thetriggering criteria for a first CC, the prohibit timer may be restarted.If during the prohibited time (e.g., the time until the prohibit timerexpires), a trigger criteria was met for another CC, a report includingthe change that resulted in the trigger may be blocked until theprohibit timer expires. Upon timer expiry, if the trigger conditionstill exists, the PH may be reported (e.g., in effect delaying thereport of the triggering condition). If the trigger condition no longerexists, the PH based on that triggering condition may not be reported.

In certain representative embodiments, the WTRU 102 may have multiplePHR prohibit timers such that the prohibiting effect of each timer maybe (e.g., only be) for CCs associated with a respective prohibit timer.

In certain representative embodiments, CCs may be grouped based on oneor more of the following: (1) UL band; (2) DL band; (3) location; (4)timing advance reference; (5) pathloss reference; and/or (6) band orlocation of the pathloss reference, among others. A group of CCs mayinclude one or more CCs.

In certain representative embodiments, the WTRU 102 may have a separatePHR prohibit timer per group of CCs. For each group of CCs, the WTRU 102may restart the PHR prohibit timer based on a PHR being triggered forthe group of CCs. For example, the WTRU 102 may have one PHR prohibittimer per band, pathloss reference and/or each location (e.g., RRH). TheWTRU 102 may also, or instead, have separate PHR prohibit timers basedupon a different grouping of cells, for example, one prohibit timer foreach TA group.

For a trigger gated by the PHR prohibit timer, such as the pathlosschange trigger, the WTRU 102 may treat the trigger for CCs in differentgroups separately. For example, the current pathloss change triggercriteria may be satisfied when the prohibitPHR-Timer expires or hasexpired and the path loss has changed more than dl-PathlossChange dB forat least one activated Serving Cell which is used as a pathlossreference since the last transmission of a PHR when the WTRU 102 has ULresources for new transmission.

The pathloss change trigger may be modified to reflect one or more ofthe following including: (1) a CC group specific PHR prohibit timerexpiry; (2) a trigger based on change of pathloss on a serving cell usedby a CC in the CC group; (3) a requirement/provision for transmission ofa real PHR (e.g., in the TTI in which the trigger criteria are beingevaluated) for at least one CC in the CC group, which may, for examplemean that, or be such that UL resources (e.g., PUSCH) are allocated,e.g., via UL grant or configured SPS, for transmission for at least oneCC in the CC group and/or that there is a PUCCH to be transmitted for atleast one CC in the CC group, among others; (4) a requirement/provisionfor UL resources for new transmission on at least one of the CCs in thegroup, or there are UL resources for new transmission on any CC.

Examples of a modified trigger are as follows. A first example mayinclude a trigger when the prohibitPHR-Timer for a CC group expires orhas expired and the path loss has changed more than dl-PathlossChange dBfor at least one activated Serving Cell which is used as a pathlossreference for a CC in that CC group since the last transmission of a PHRwhen the WTRU 102 has UL resources for new transmission for a CC in thatCC group. A second example may include a trigger when theprohibitPHR-Timer for a CC group expires or has expired and the pathloss has changed more than dl-PathlossChange dB for at least oneactivated Serving Cell which is used as a pathloss reference for a CC inthat CC group since the last transmission of a PHR when the WTRU 102 hasUL resources allocated for transmission for a CC in that CC group and ULresources for new transmission.

In the second example, the UL resources for the new transmission may beon any CC.

In the case of UL CCs in multiple bands, it is possible that every timea PHR is sent, the PH for the CCs in one of the bands may all bevirtual. To ensure the WTRU 102 at least occasionally sends a real PHfor CCs in all bands in which the WTRU 102 has active UL CCs,modifications may be implemented in certain representative embodiments.

There may be one PHR periodic timer, periodicPHR-Timer, such that whenit expires the PHR may be triggered and the PHR may be transmitted ifany cell has UL resources for new transmission. One modification mayinclude that for each group of CCs, the WTRU 102 may have a separate PHRperiodic timer. When a PHR periodic timer expires for a CC group, theWTRU 102 may trigger the PHR and send the PHR when one or more of thefollowing conditions are met. A first condition for triggering andsending the PHR may include that there are UL resources allocated (e.g.,PUSCH) for transmission for at least one CC in the CC group. A secondcondition may include that there is a PUCCH to be transmitted for atleast one CC in the CC group. A third condition may include that thereare UL resources for new transmission on at least one of the CCs in theCC group, or there are UL resource for new transmission on any CC.

UL resources allocated for transmission may be allocated by configuredSPS or via UL grant.

The WTRU 102 may restart the PHR periodic timer for a group of CCs whenthe WTRU 102 sends a PHR with a real PH for one or more CCs in thatgroup.

There may be a trigger such that when a SCell with configured UL isactivated, the PHR is triggered and sent by the WTRU 102 when any cellhas UL resources for new transmission. If this activation is not areactivation, the PHR may be sent with a virtual PH for the newlyactivated SCell (e.g., since there may be a grant on the PCell oranother SCell before there has been time for the WTRU 102 to receive anUL grant for the newly activated SCell).

In the case of intra-band CA, this triggering procedure may beacceptable or applicable since at least one UL CC in the same band asthe newly activated SCell had UL resources for new transmission and areal PH is to be included for at least that CC which may provideP_(CMAX,c). The P_(CMAX,c) for CCs in the same band are contemplated tobe the same unless P_(EMAX,c) is different for each, and the eNB 140 mayknow whether the P_(EMAX,c) are the same or a different value for CCs inthe same band (e.g., since the eNB 140 may configure the P_(EMAX,c)values). It is contemplated the P_(CMAX) may be determined fromP_(CMAX,c) in the same band. In the intra-band case, the eNB 140 mayhave sufficient information for scheduling (e.g., intelligentlyscheduling) the newly activated SCell.

In the case of inter-band CA, it may not be acceptable to receivevirtual PH if no other CC in the band is providing P_(CMAX,c) (e.g.,since the P_(CMAX,c) value in different bands may be unrelated).

In certain representative embodiments, the triggering and sending of thePHR based on the event of SCell activation (e.g., activation afterdeactivation, and/or first activation after configuration orreconfiguration, among others) may be delayed by the WTRU 102 based oncertain criteria being met. The WTRU 102 may delay the triggering andsending of the PHR until there are UL resources allocated on at leastone CC in the CC group of the SCell that was activated (e.g., where thegroup may be based on the frequency band) and/or there are UL resourcesfor new transmission for at least one CC in that group. The WTRU 102 maydelay the triggering and sending of the PHR if one or more of thefollowing criteria is met: (1) the SCell is or may be the only UL CC, orthe only CC with configured uplink, in a CC group, such as a group basedon band; and/or (2) the PHR that is to be sent as a result of theactivation trigger, for example in the first TTI that satisfies theactivation trigger requirements, may include virtual PH for all the CCsin the group of that activated SCell; among others.

In certain representative embodiments, while still maintaining the PHRtrigger upon SCell activation, the WTRU 102 may additionally trigger PHRsometime after the activation event (e.g., as soon as possible after theactivation event) when there are UL resources allocated on at least oneCC in the CC group of the SCell that was activated (e.g., where thegroup may be based on the frequency band) and/or there are UL resourcesfor new transmission for at least one CC in that group.

A representative example of how the PHR may be delayed until a real PHmay be transmitted for at least one cell in the same CC group (forexample the same band) as the newly activated SCell may be to includeone or more of the following trigger criteria which may be new triggercriteria or may replace the existing SCell activation trigger criteria.

For example, a trigger may occur when a SCell with configured uplinkthat is part of a certain CC group is or may be activated and thefollowing conditions are satisfied (e.g., are true) in this TTI: thereare UL resources allocated for transmission on a cell with a configureduplink that is in the certain CC group and the PHR has not beentransmitted with the UL resources allocated for transmission on a cellwith configured uplink that is in the certain CC group since the SCellwas activated.

In another example, a trigger may occur when a SCell with configureduplink that is part of a certain CC group is or may be activated and thefollowing conditions are satisfied (e.g., are true) in this TTI: Thereare UL resources allocated for transmission on a cell with configureduplink that is in the certain CC group and the PHR has not beentransmitted with the UL resources allocated for transmission on a cellwith configured uplink that are in the certain CC group since the SCellwas first activated following deactivation, configuration,re-configuration, and/or since the SCell was configured or reconfigured,among others.

As discussed above, when operating with multiple bands in the UL andwith multiple CCs per band, the WTRU 102 may configure a maximum outputpower per UL band, P_(CMAX,b). If the sum of the computed powers for theCCs in band b without scaling would or is to exceed P_(CMAX,b), the WTRU102 may scale the computed powers.

The WTRU 102 may include the P_(CMAX,b) in the PHR based on rulessimilar to those defined herein for when to include P_(CMAX).

The WTRU 102 may include P_(CMAX,b) in the PHR, which may be in theExtended PHR MAC CE or another PHR MAC CE. The WTRU 102 may alwaysinclude P_(CMAX,b) in the PHR or may include P_(CMAX,b) in the PHR basedon any one or more of the criteria identified for P_(CMAX) above and/orbased on one or more of the following criteria being met (or satisfied):

-   -   (1) A configuration criteria, which may be satisfied if the WTRU        102 is configured for inter-band UL with at least one UL CC in        each of at least two bands and, for example, at least 2 UL CCs        in at least one of the bands.    -   (2) An activated/CC criteria, which may be satisfied if the PHR        includes (or will or is to include) reports for CCs in at least        two bands (e.g., with reports for at least two CCs in at least        one of the bands), which may, for example, mean that, or be such        that (a) there may be at least one activated CC in each of at        least two bands (e.g., with at least two activated CCs in at        least one of the bands), for which PH is (or is to be) included        in the PHR, and the PH for each of those CCs may be real or        virtual; and/or (b) there may be at least one CC in each of at        least two bands (e.g., with at least two CCs in at least one of        the bands) for which PH is (or is to be) included in the PHR and        the PH for each of those CCs may be real or virtual; among        others.    -   (3) A real PH criteria, which may be satisfied if the PHR        includes (or will or is to include) a real PH for CCs in at        least two bands (e.g., with at least 2 CCs in at least one of        those bands), which may, for example, mean that, or be such        that (a) a V-bit may indicate real PH for at least one CC in        each of at least 2 bands (and/or, e.g., for at least 2 CCs in at        least one of those bands); and/or (b) the P_(CMAX,c) may be (or        is to be) included in the PHR for at least one the CC in each of        at least 2 bands (and/or, e.g., for at least 2 CCs in at least        one of those bands); and/or (c) for at least one CC in each of        at least 2 bands (and/or, e.g., for at least 2 CCs in at least        one of those bands), there are UL resources (e.g., PUSCH and/or        PUCCH) in the subframe for which (or in which) the PHR is being        reported; and/or (d) for at least one CC in each of at least 2        bands (and/or, e.g., for at least 2 CCs in at least one of those        bands), there may be UL resources allocated in the subframe for        which (or in which) the PHR is being reported where UL resources        may be allocated by UL grant or by configured SPS and such        allocation may result in a PUSCH transmission; and/or (e) for at        least one CC in each of at least 2 bands (and/or, e.g., for at        least 2 CCs in at least one of those bands) there may be UL        resources allocated or a PUCCH transmission in the subframe for        which (or in which) PHR is being reported where UL resources may        be allocated by UL grant or by configured SPS and such        allocation may result in a PUSCH transmission; among others.    -   (4) A scaling criteria, which may be satisfied if in the        subframe for which (or in which) the PHR is being reported, the        WTRU 102 scales or may scale one or more of the CC (or CC        channel) powers it computed, for example, because the sum of the        CC computed powers would or is to exceed the P_(CMAX,b) for one        or more of the UL bands.

An indication that scaling is applied in a particular band may be addedto the PHR. The indication, which may be associated with each signaledP_(CMAX,b), may be signaled. The criteria used for the presence of theband scaling indicator may be the same criteria as discussed above forthe presence of P_(CMAX,b).

It is contemplated that criteria (3) set forth above may be a subset ofcriteria (2) and criteria (2) may be a subset of criteria (1) for thecase in which a CC with a real PH is an activated CC and an activated CCis a configured CC. In this case, non-redundant criteria may be each ofcriteria (1), criteria (2), criteria (3) and/or criteria (4) alone andthe combinations, for example, of criteria (1) and (4); criteria (2) and(4), and/or criteria (3) and (4).

For one or more of the criteria above, if the criteria is met, the WTRU102 may include the P_(CMAX,b) for all UL bands in the PHR. In certainrepresentative embodiments, the WTRU 102 may include the P_(CMAX,b) forthe bands (e.g., only for the bands) for which there are at least 2 CCs(e.g., UL CCs) and for example, only if one or more of the followingconditions are true that: (a) those CCs have configured UL, for examplefor criteria (1); (b) those CCs have configured UL and are activated,for example for criteria (2); (c) the PHR may be real for those CCs inthe TTI in which PHR will be sent, for example for criteria (3); and/or(d) the scaling of the computed power of one or more of those CCs (or CCchannels) was useful or required because the sum of the computed powersof the CCs in the band would or is to exceed P_(CMAX,b) in the TTI inwhich PHR may or will or is to be sent, for example for criteria (4).

If the criteria for including the P_(CMAX,b) is based on criteria (4)alone or combined with any of the other criteria, the eNB 140 may nothave sufficient information to determine if P_(CMAX,b) is included inthe PHR.

In certain representative embodiments, the WTRU 102 may include one ormore of the following in the PHR: (1) an indication as to whether theWTRU 102 performed scaling on one or more CCs in a certain CC group,such as a band, when computing output power to avoid the situation ofexceeding the WTRU maximum allowed transmit power for that band whichmay be the WTRU 102 configured maximum output power for that band,P_(CMAX,b) (The indication may be a bit or other indication and may inaddition to or instead be used to indicate if P_(CMAX,b) is present inthe PHR, for example, for a certain CC group.); and/or (2) an indicationas to whether P_(CMAX,b), for example, for a certain CC group, isincluded in the PHR, e.g., a presence indicator, for example as a singlebit in the PHR and may be in addition to a scaling indication.

The band specific scaling indication may be present if the P_(CMAX,b)for a given band is present in the PHR. Any of the P_(CMAX,b) presencecriteria discussed above may also apply to the band specific scalingindicator.

The P_(CMAX,b) may provide useful information in other situations thaninter-band CA, such as non-contiguous intra-band or contiguousintra-band CA. One or more of the criteria for including P_(CMAX,b) thatare based on having CCs in multiple bands may be equally applicable inthe case of non-contiguous intra-band and/or contiguous intra-band.Criteria relating to CCs in different bands may be extended to criteriarelating to CCs in different scenarios of other types such as CCs withdifferent carrier frequencies for example in the case of non-contiguousintra-band CA or CCs which are non-colocated serving cells, amongothers.

References 911-919 indicate various descriptions associated with FIG. 9.Reference 911 describes any trigger (trigger1) (e.g., pathloss) and thatMPR dominates. Reference 912 describes a PHR trigger due to large changein P-MPR, that P-MPR dominates, that P_(CMAX,c) uses Level C, and thatthe eNB can determine P-MPR. Reference 913 describes a PHR trigger dueto large change in P-MPR, that MPR dominates, and that the eNB no longerknows what P-MPR is. Reference 914 describes a PHR trigger due to changefrom P-MPR not dominating to P-MPR dominating, P_(CMAX,c), uses Level B,and that the eNB can determine P-MPR. Reference 915 describes that theeNB can track MPR and estimate PH since MPR dominates. Reference 916describes that the eNB can track MPR based on scheduling, that the eNBknows what P-MPR was from last PHR, that the eNB can figure out when MPRdominates and when P-MPR dominates and that the eNB can estimate PH.Reference 917 describes that the eNB can track MPR. eNB can estimate PHas long as MPR dominates. Reference 918 describes that the eNB can trackMPR, that the eNB knows what P-MPR was from last PHR, that the eNB canfigure out when MPR dominates and when P-MPR dominates and that the eNBcan estimate PH. Reference 919 describes that without Trigger 4, the eNBwould not know when P-MPR is dominating (since it does not know P-MPR)and may schedule incorrectly.

FIG. 10 is a flowchart illustrating a representative PHR method 1000.

Referring to FIG. 10, the representative PHR method 1000 may manage PHRassociated with a WTRU 102. At block 1010, the WTRU 102 may determine aP-MPR (e.g., sometimes referred to as P-PR) for the WTRU 102. Using oneor more of the equations set forth above, at block 1020, the WTRU 102may determine a backoff value for reducing a value of maximumtransmission power for the WTRU 102. The backoff value may include anynumber of different factors introduced in the equations above. At block1030, the WTRU 102 may report PH to the eNB 140 in accordance with thedetermined backoff value.

In certain representative embodiments, the WTRU 102 may calculate thebackoff value based on the P-MPR or P-PR (e.g., when the P-MPR dominatesthe composite of the MPR and the A-MPR).

The WTRU 102 may select between one of the further value and the P-MPR,as a selected value and may calculate the backoff value based on theselected value.

The WTRU 102 may calculate the P-MPR based on at least a specificabsorption rate (SAR) indicating a rate of absorption of radio frequencyenergy associated with the WTRU 102. For example, when the WTRU 102 isheld close to or adjacent from a person, the specific absorption ratemay increase (e.g., sharply increase) for example, based on proximity ofthe person to the WTRU 102. As such, the P-MPR may increase (sharplyincrease) and may dominate the other backoff effects such as MPR andA-MPR. In certain representative embodiments, the WTRU 102 may comparethe further value (e.g., associated with the MPR and the A-MPR) to theP-MPR value to determine which is greater. Responsive to the furthervalue being greater than the P-MPR (e.g., the first value dominating),the WTRU 102 may calculate the backoff value in accordance with thefurther value (e.g., using only the first value, exclusive of theP-MPR). Responsive to the further value being less than the P-MPR (e.g.,the P-MPR dominating), the WTRU 102 may calculate the backoff value inaccordance with the P-MPR (e.g., only the P-MPR, exclusive of thefurther value).

In certain representative embodiments, the WTRU 102 may determine thatthe further value may be based on a MPR and an A-MPR for each CC usedfor UL transmission by the WTRU 102 and may determine the P-MPR for eachCC used for UL transmission by the WTRU 102.

The P-MPR, the backoff value and the power headroom reporting may eachbe associated with one of: (1) a CC associated with the WTRU 102 or (2)a composite of the CCs associated with the WTRU 102. For example, if theWTRU 102 is operating on non-contiguous frequency bands, thedeterminations or calculations for the P-MPR, the backoff value and/orthe power headroom reporting may each be associated with one CCassociated with a frequency band or the composite of the CCs associatedwith each of the non-contiguous frequency bands for inter-bandoperations. In certain representative embodiments, the reporting of thePH may include sending, for each carrier component, a PHR associatedtherewith or sending one PHR (e.g., a composite report) including PHvalues associated with each carrier component.

In certain representative embodiments, the WTRU 102 may calculate thebackoff value as a the maximum of: (1) the further value (e.g., andoptionally another value) and (2) the P-MPR.

The WTRU 102 may calculate the backoff value using one of: a firstprocedure for an inter-band uplink (UL) transmission or a secondprocedure for an intra-band UL transmission. For example, the proceduresfor calculating backoff for inter-band UL transmission by the WTRU 102may be different from procedures for calculating backoff for intra-bandUL transmission.

In certain representative embodiments, on a condition that the sum ofthe WTRU computed powers for the UL CCs without scaling (e.g., anyscaling) is to exceed (e.g., is going to exceed) a maximum transmissionpower limit, the WTRU 102 may indicate to the eNB 140 that the WTRU 102has scaled the CC powers before transmission to avoid exceeding themaximum transmission power limit. The WTRU 102 may also scale the CCpowers in accordance with the indication to the eNB 140.

In certain representative embodiments, such as those used with multipleCCs, the WTRU 102 may generate a PHR having at least two PH valuesassociated with CCs in at least two frequency bands. The PH values mayinclude PH values associated with real transmissions for the at leasttwo frequency bands.

In certain representative embodiments, the WTRU 102 may indicate in thePHR whether the WTRU 102 performed scaling when computing output power(e.g., by a scaling bit or scaling flag).

FIG. 11 is a flowchart illustrating another representative PHR method1100

Referring to FIG. 11, the representative PHR method 1100 may report aWTRU status. At block 1110, the WTRU 102 may determine whether the WTRU102 applies a power backoff based on a P-MPR for the WTRU 102. At block1120, the WTRU may report to a network resource (e.g., the eNB 140) thatthe WTRU 102 has applied the power backoff based on the P-MPR. The WTRU102 may also set a domination indicator when the power backoff is basedon the P-MPR and may report or send the domination indicator to thenetwork resource. The domination indicator may be in a PHR included in amedia access controller (MAC) control element (CE) sent to the networkresource. A domination indicator may be set for each component carrierimpacted by its associated P-MPR and/or a single (e.g.,overall/composite) domination indicator may be associated with the WTRU102.

In certain representative embodiments, the WTRU 102 may change thedomination indicator to: (1) a first logic level responsive to the powerbackoff being impacted by the P-MPR; or (2) a second logic levelresponsive to the power backoff not being impacted by the P-MPR.

FIG. 12 is a flowchart illustrating a further representative PHR method1200

Referring to FIG. 12, the representative PHR method 1200 may manage PHRsassociated with a WTRU 102. At block 1210, the WTRU 102 may determinewhether a real power transmission may occur for a CC at a first period(e.g., the current period or current TTI period). At block 1220 the WTRUmay determine a previous period when a real transmission occurred forthe CC (e.g., when the CC had UL resources for a UL transmission) Atblock 1230, the WTRU 102 may compare the P-MPR (or P-PR) of the CCassociated with a first period (e.g., the current period or current TTIperiod) with the P-PR of the CC associated with a second period (e.g., aprevious period), for example, associated with the most recent TTIassociated with a PHR being transmitted and the CC having a realtransmission). At block 1240, the WTRU may trigger a PHR in accordancewith the comparison result.

For example, the PHR associated with the CC may be triggered based onthe comparison result (e.g., when the magnitude of change of the P-PRfrom the first to the second period changes more than a thresholdamount). The determination of whether the transmission on the CC in thefirst or second periods is real may include a determination whether anuplink grant is associated with the CC in the first or second periods,respectively.

FIG. 13 is a flowchart illustrating an additional representative PHRmethod 1300

Referring to FIG. 13, the representative PHR method 1300 may manage PHreporting associated with a WTRU 102. At block 1310, the WTRU 102 maydetermine whether a condition associated with P-MPRs taken over aplurality of TTIs has changed temporarily, as a determined result. Atblock 1320, the WTRU 102 may trigger reporting of the PH based on thedetermined result.

In certain representative embodiments, the WTRU 102 may determine asequence of P-MPRs for the plurality of TTIs (e.g., associated withthose TTIs) by successively determining the sequence of P-MPR, eachduring a respectively different TTI.

In certain representative embodiments, the determination of whether thecondition has changed temporarily may include a determination whethervalues of the P-MPR during the sequence of TTIs have changed to satisfythe condition for more than a threshold period. For example, a specifiedperiod may be set or configured by the WTRU 102 or network resource,which may be relative to a current time, as a lookback window (which maybe a sliding window that moves/slides as the current time changes suchthat the condition may be measured/satisfied based on parameters withinthe lookback window). For example, the condition may be satisfied if thecondition exists for at least a portion of the lookback window of morethan the threshold period.

In certain representative embodiments, a trigger prohibit timer may beinitiated by the triggering of a PHR to prevent a second premature PHRsuch that triggering of the PH reporting may be stopped or prevented(e.g., even if other conditions may warrant the second trigger) untilthe trigger prohibit time is exceeded from the time of the initiation ofthe trigger prohibit timer.

The WTRU 102 may calculate the backoff value as one of: (1) a highestvalue of the P-MPR; (2) a lowest value of the P-MPR; (3) a mean value ofthe P-MPR; or (4) a median value of the P-MPR from within the lookbackwindow.

In certain representative embodiments, a PHR trigger due to P-MPR may bemodified to eliminate bias caused by reports of virtual headroom in thePHR.

FIG. 14 is a flowchart illustrating a still further representative PHRmethod 1400.

Referring to FIG. 14, the representative PHR method 1400 may manage PHreporting associated with a WTRU 102. At block 1410, the WTRU 102 maydetermine a first backoff value indicating a first reduction in a valueof the maximum transmission power for the WTRU 102 based on orassociated with at least one of: (1) Maximum Power Reduction (MPR) or(2) Additional MPR (A-MPR). At block 1420, the WTRU 102 may determine asecond backoff value indicating a second reduction in the value of themaximum transmission power for the WTRU 102 based on Power ManagementMaximum Power Reduction (P-MPR). At block 1430, the WTRU 102 may selectone of the first or second backoff values based on which of the first orsecond backoff values dominate. At block 1440, the WTRU 102 may reportthe PH in accordance with the selected backoff value.

FIG. 15 is a flowchart illustrating a still additional representativePHR method 1500

Referring to FIG. 15, the representative PHR method 1500 may managetransmission power associated with (e.g., implemented by) a WTRU 102. Atblock 1510, the WTRU 102 may trigger during a TTI a PHR based on changesto backoff or the impacts of backoff. At block 1520, the WTRU 102 maytransmit the PHR during the TTI.

FIG. 16 is a flowchart illustrating a still additional representativePHR method 1600

Referring to FIG. 16, the representative PHR method 1600 may managetransmission power associated with (e.g., implemented by) a WTRU 102. Atblock 1610, the WTRU 102 may calculate a maximum output power of theWTRU using a power management based backoff. At block 1620, the WTRU 102may trigger a PHR based on changes to the power management based backoffor the impacts of the power management based backoff.

FIG. 17 is a flowchart illustrating a yet further representative PHRmethod 1700

Referring to FIG. 17, the representative PHR method 1700 may implement atransmission power determination associated with (e.g., implemented by)a WTRU 102. At block 1710, the WTRU 102 may determine a power managementbased backoff for reducing the maximum transmission power. At block1720, the WTRU 102 may report the reduced maximum transmission powerbased on the determined power management based backoff.

FIG. 18 is a flowchart illustrating a yet further representative PHRmethod 1800.

Referring to FIG. 18, the representative PHR method 1800 may managetransmission power associated with (e.g., implemented by) a WTRU 102. Atblock 1810, the WTRU 102 may trigger a PHR based on changes to backoffor the impacts of backoff. At block 1820, the WTRU 102 may eliminate PHRtriggers caused by virtual PHRs, for example, by modifying the PHRtrigger due to power management based backoff to eliminate the biascaused by reports of virtual headroom in the PHR.

The PH may be calculated as a difference between the WTRU 102 calculatedtransmit power and a configured maximum output power. In certainrepresentative embodiments, the WTRU 102 may compute a value used for PHfor each of a plurality of CCs.

In certain representative embodiments, the WTRU 102 may apply the MPR(e.g., MPR and/or A-MPR) effects in parallel with the non-MPR effects(e.g., reducing the maximum output power per CC in a subframe.

The WTRU 102 may trigger the PHR generation in response to detection ofa change in the power management based backoff and/or may indicate inthe PHR how the power management based backoff affects the maximumoutput power for each CC reported.

In certain representative embodiments, the WTRU 102 may use the powermanagement based backoff when the WTRU 102 is in an ON state.

In certain representative embodiments, the UL transmission may be burstysuch that triggering, by the WTRU 102 of the PHR may include a reducedmaximum output power per component carrier value in response to a firsttransmission burst (e.g., which may set an information element burstmode to ON).

In certain representative embodiments, the PHR may be sent and mayinclude the maximum output power per CC value that is a worst-casebackoff that occurred in a time period since a last occurrence of a PHR.

In certain representative embodiments, the WTRU 102 may report a maximumoutput power per CC value in a virtual PHR (e.g. on a condition that themaximum output power per CC value is affected by the power managementbased backoff).

In certain representative embodiments, the WTRU 102 may set a maximumoutput power using one of: (1) a first mode based on the WTRU 102operating in more than one frequency band; or (2) a second mode based onthe WTRU 102 operating in one frequency band. When the WTRU 102 operatesin the first mode, the MPR, the A-MPR, a ΔTc, or a power managementbased backoff may be different respective values for each frequencyband.

In certain representative embodiments, physical uplink shared channels(PUSCHs) without uplink control information (UCI) may be equally scaledon a condition that the UCI is simultaneously transmitted on physicaluplink control channel (PUCCH) and PUSCH, and a total transmit power ofthe WTRU 102 is not to exceed P_(CMAX), and the sum of PUCCH power plusPUSCH with UCI power is not to exceed P_(CMAX). In certainrepresentative embodiments, the PUSCH with the UCI may be scaled whilethe PUSCH without the UCI may not be transmitted, when the totaltransmit power of the WTRU 102 is to exceed P_(CMAX), and the sum of thePUCCH power plus the PUSCH with the UCI power is to exceed P_(CMAX).

In certain representative embodiments, the triggering of the PHR mayinclude triggering the PHR based on a factor that dominates the maximumpower calculation.

FIG. 19 is a flowchart illustrating a representative power transmissionadjustment method.

Referring to FIG. 19, the representative method 1900 may managetransmission power of a WTRU 102. At block 1910, the WTRU 102 maydetermine a Power Management Power Reduction (P-PR). At block 1920, theWTRU 102 may determine a backoff value for reducing a value of themaximum transmission power for the WTRU 102. At block 1930, the WTRU 102may adjust transmission power in accordance with the determined backoffvalue.

In certain representative embodiments, the WTRU 102 may calculate thebackoff value based on the P-PR.

In certain representative embodiments, the WTRU 102 may compare afurther value to the P-PR; and responsive to the further value beinggreater than the P-PR, the WTRU may adjust of transmission power inaccordance with the further value, exclusive of the P-PR. In otherrepresentative embodiments, responsive to the further value being lessthan the P-PR, the WTRU 102 may adjust of transmission power inaccordance with the P-PR, exclusive of the further value.

In certain representative embodiments, the WTRU may base the furthervalue on a Maximum Power Reduction (MPR), and an Additional MPR (A-MPR)for each carrier component used for transmission by the WTRU 102.

In certain representative embodiments, The WTRU 102 may scale atransmission power of the component carriers used for transmission bythe WTRU 102 such that a composite of the actual transmission power ofthe component carriers does not exceed the adjusted maximum transmissionpower of the WTRU 102.

In certain representative embodiments, responsive to a sum of the WTRUcomputed powers for the uplink component carriers (CCs) without scalingexceeding a maximum transmission power limit, the WTRU 102 may scale theCC powers before transmission to avoid exceeding the maximumtransmission power limit.

FIG. 20 is a flowchart illustrating a further representative powertransmission adjustment method.

Referring to FIG. 20, the representative method 2000 may managetransmission power of a WTRU 102. At block 2010, the WTRU 102 maydetermine whether a condition associated with Power Management PowerReductions (P-PRs) taken over a plurality of transmission time intervals(TTIs) has changed temporarily, as a determined result. At block 2020,the WTRU 102 may adjust power transmission of the WTRU based on thedetermined result.

In certain representative embodiments, the WTRU 102 may determine theP-PRs for the plurality of TTIs by the WTRU 102 successively determiningthe P-PR during respectively different TTIs.

In certain representative embodiments, the WTRU may determine whethervalues of the P-PR during the TTIs have changed to satisfy the conditionfor more than a threshold period.

In certain representative embodiments, the WTRU 102 may set a specifiedperiod relative to a current time, as a lookback window; and maydetermine whether the condition is satisfied in the lookback window.

In certain representative embodiments, the WTRU 102 may determinewhether the condition exists for at least a portion of the lookbackwindow of more than the threshold period.

In certain representative embodiments, the WTRU 102 may set the lookbackwindow to be a specified period relative to the current time.

In certain representative embodiments, the WTRU 102 may change thelookback window as the current time changes.

In certain representative embodiments, the WTRU 102 may determine theP-PR as one of: (1) a highest value of P-PR; (2) a lowest value of P-PR;(3) a mean value of P-PR; or (4) a median value of P-PR; and may use thedetermined value in the adjustment of the maximum transmission power ofthe WTRU 102.

Although features and elements are described above in particularcombinations, one of ordinary skill in the art will appreciate that eachfeature or element can be used alone or in any combination with theother features and elements. In addition, the methods described hereinmay be implemented in a computer program, software, or firmwareincorporated in a computer readable medium for execution by a computeror processor. Examples of non-transitory computer-readable storage mediainclude, but are not limited to, a read only memory (ROM), random accessmemory (RAM), a register, cache memory, semiconductor memory devices,magnetic media such as internal hard disks and removable disks,magneto-optical media, and optical media such as CD-ROM disks, anddigital versatile disks (DVDs). A processor in association with softwaremay be used to implement a radio frequency transceiver for use in aWTRU, UE, terminal, base station, RNC, or any host computer.

Moreover, in the embodiments described above, processing platforms,computing systems, controllers, and other devices containing processorsare noted. These devices may contain at least one Central ProcessingUnit (“CPU”) and memory. In accordance with the practices of personsskilled in the art of computer programming, reference to acts andsymbolic representations of operations or instructions may be performedby the various CPUs and memories. Such acts and operations orinstructions may be referred to as being “executed,” “computer executed”or “CPU executed.”

One of ordinary skill in the art will appreciate that the acts andsymbolically represented operations or instructions include themanipulation of electrical signals by the CPU. An electrical systemrepresents data bits that can cause a resulting transformation orreduction of the electrical signals and the maintenance of data bits atmemory locations in a memory system to thereby reconfigure or otherwisealter the CPU's operation, as well as other processing of signals. Thememory locations where data bits are maintained are physical locationsthat have particular electrical, magnetic, optical, or organicproperties corresponding to or representative of the data bits.

The data bits may also be maintained on a computer readable mediumincluding magnetic disks, optical disks, and any other volatile (e.g.,Random Access Memory (“RAM”)) or non-volatile (“e.g., Read-Only Memory(“ROM”)) mass storage system readable by the CPU. The computer readablemedium may include cooperating or interconnected computer readablemedium, which exist exclusively on the processing system or aredistributed among multiple interconnected processing systems that may belocal or remote to the processing system. It is understood that therepresentative embodiments are not limited to the above-mentionedmemories and that other platforms and memories may support the describedmethods.

One of ordinary skill also understands that different functions and/orelements of disclosed embodiments may be used individually or incombination without departing from the invention.

One of ordinary skill also understands that the representativeprocedures and methods set forth herein may be used in both Timedivision duplex (TDD) and frequency division duplex (FDD) System.

Although WTRUs have been described using particular access technologies(e.g., radio access technologies (RATs) such as LTE and CDMA, it iscontemplated that the WTRUs may operate as multi-mode devices (e.g.,simultaneously in more than one RAT).

No element, act, or instruction used in the description of the presentapplication should be construed as critical or essential to theinvention unless explicitly described as such. Also, as used herein, thearticle “a” is intended to include one or more items. Where only oneitem is intended, the term “one” or similar language is used. Further,the terms “any of” followed by a listing of a plurality of items and/ora plurality of categories of items, as used herein, are intended toinclude “any of,” “any combination of,” “any multiple of,” and/or “anycombination of multiples of” the items and/or the categories of items,individually or in conjunction with other items and/or other categoriesof items. Further, as used herein, the term “set” is intended to includeany number of items, including zero. Further, as used herein, the term“number” is intended to include any number, including zero.

Moreover, the claims should not be read as limited to the describedorder or elements unless stated to that effect. In addition, use of theterm “means” in any claim is intended to invoke 35 U.S.C. §112, ¶6, andany claim without the word “means” is not so intended.

Suitable processors include, by way of example, a general purposeprocessor, a special purpose processor, a conventional processor, adigital signal processor (DSP), a plurality of microprocessors, one ormore microprocessors in association with a DSP core, a controller, amicrocontroller, Application Specific Integrated Circuits (ASICs),Application Specific Standard Products (ASSPs); Field Programmable GateArrays (FPGAs) circuits, any other type of integrated circuit (IC),and/or a state machine.

A processor in association with software may be used to implement aradio frequency transceiver for use in a wireless transmit receive unit(WTRU), user equipment (UE), terminal, base station, Mobility ManagementEntity (MME) or Evolved Packet Core (EPC), or any host computer. TheWTRU may be used in conjunction with modules, implemented in hardwareand/or software including a Software Defined Radio (SDR), and othercomponents such as a camera, a video camera module, a videophone, aspeakerphone, a vibration device, a speaker, a microphone, a televisiontransceiver, a hands free headset, a keyboard, a Bluetooth® module, afrequency modulated (FM) radio unit, a Near Field Communication (NFC)Module, a liquid crystal display (LCD) display unit, an organiclight-emitting diode (OLED) display unit, a digital music player, amedia player, a video game player module, an Internet browser, and/orany Wireless Local Area Network (WLAN) or Ultra Wide Band (UWB) module.

Although the invention has been described in terms of communicationsystems, it is contemplated that the systems may be implemented insoftware on microprocessors/general purpose computers (not shown). Incertain embodiments, one or more of the functions of the variouscomponents may be implemented in software that controls ageneral-purpose computer.

In addition, although the invention is illustrated and described hereinwith reference to specific embodiments, the invention is not intended tobe limited to the details shown. Rather, various modifications may bemade in the details within the scope and range of equivalents of theclaims and without departing from the invention.

Embodiments

In one embodiment, a method of managing power headroom reportingassociated with a wireless transmit/receive unit (WTRU), may comprisesdetermining a Power Management Power Reduction (P-PR); determining abackoff value for reducing a value of maximum transmission power for theWTRU; and reporting power headroom in accordance with the determinedbackoff value.

In one embodiment, the determining of the backoff value may includecalculating the backoff value based on the P-PR.

In one embodiment, the determining of the backoff value may includedetermining a further value for reducing a value of maximum transmissionpower for the WTRU; selecting between one of the further value and theP-PR, as a selected value; and calculating the backoff value based onthe selected value.

In one embodiment, the determining of the P-PR may include at leastcalculating the P-PR based on at least a specific absorption rate (SAR)indicating a rate of absorption of radio frequency energy associatedwith the WTRU.

In one embodiment, the method may further comprise comparing the furthervalue to the P-PR; and responsive to the further value being greaterthan the P-PR, calculating the backoff value in accordance with thefurther value, exclusive of the P-PR.

In one embodiment, the method may further comprise: comparing thefurther value to the P-PR; and responsive to the further value beingless than the P-PR, calculating the backoff value in accordance with theP-PR, exclusive of the further value.

In one embodiment, the further value may be based on a Maximum PowerReduction (MPR), and an Additional MPR (A-MPR).

In one embodiment, the method may further comprise calculating thefurther value by algebraically combining values based on the MPR and theA-MPR.

In one embodiment, the P-PR, the backoff value and the power headroomreporting may be each associated with one of: (1) a component carrierassociated with the WTRU or (2) a composite of component carriersassociated with the WTRU.

In one embodiment, the reporting of the power headroom may includesending, for each component carrier, a power headroom report associatedtherewith

In one embodiment, the calculating of the backoff value based on theselected value may include calculating a maximum output power using themaximum of the further value and the P-PR.

In one embodiment, the P-PR, the backoff value, the power headroomreporting and the maximum output power may be each associated with anindividual component carrier of the WTRU.

In one embodiment, the method may further comprise calculating a maximumoutput power using a maximum of the P-PR and a composite of the furthervalue and another value.

In one embodiment, the method may further comprise configuring maximumoutput power between an upper bound and a lower bound where the lowerbound is set by the following equation:

P _(CMAX) _(—) _(L)=MIN{P _(EMAX,) −ΔT _(C) ,P_(PowerClass)−MAX(MPR+A-MPR,P-PR)−ΔT _(C),}

where P_(EMAX) is a quantity signaled to the WTRU, ΔT_(C), is a powerreduction that is based on the WTRU transmission frequency,P_(PowerClass) is the maximum power of the WTRU's power class, MPR is aMaximum power reduction for the WTRU, A-MPR is a additional MPR, andP-PR is a power management power reduction.

In one embodiment, the method may further comprise configuring maximumoutput power for an individual component carrier between an upper boundand a lower bound where the lower bound is set by the followingequation:

P _(CMAX) _(—) _(L,c)=MIN{P _(EMAX,c) −ΔT _(C,c) ,P_(PowerClass)−MAX(MPR+A-MPR,P-PR)−ΔT _(C,c)}

where P_(EMAX,c) is a quantity signaled to the WTRU, Δ_(C,c), is a powerreduction that is based on the WTRU transmission frequency for theindividual component carrier, P_(PowerClass) is the maximum power of theWTRU's power class, MPR is a Maximum power reduction for the WTRU, A-MPRis a additional MPR, and P-PR is a power management power reduction.

In one embodiment, the determining of the backoff value may includecalculating the backoff value using one of: a first procedure for aninter-band uplink (UL) transmission or a second procedure for anintra-band UL transmission.

In one embodiment, the method may further comprise on a condition that asum of WTRU computed powers for UL component carriers (CCs) withoutscaling is to exceed a maximum transmission power limit, indicating thatthe WTRU has scaled the CC powers before transmission to avoid exceedingthe maximum transmission power limit.

In one embodiment, the reporting of the power headroom may includesending a power headroom report (PHR) including power headroom valuesfor component carriers in at least two frequency bands.

In one embodiment, the reporting of the power headroom may includesending a power headroom report including actual power headroom valuesassociated with at least two bands.

In one embodiment, the method may further comprise indicating, in thePHR, whether the WTRU performed scaling when computing output power.

In one embodiment, the method may further comprise determining whetherthe WTRU applies a backoff value based on the P-PR; and reporting to anetwork resource that the WTRU has applied the backoff value based onthe P-PR.

In one embodiment, the reporting that the WTRU has applied the backoffvalue based on the P-PR may include: setting a domination indicator whenthe backoff is based on the P-PR; and sending the domination indicatorto the network resource.

In one embodiment, the reporting that the WTRU has applied the backoffvalue based on the P-PR may include: including a domination indicator ina power headroom (PH) report.

In one embodiment, the sending of the domination indicator may includesending the power headroom report including the domination indicator tothe network resource in a medium access control (MAC) control element(CE).

In one embodiment, the setting of the domination indicator may includesetting one of: (1) a respective domination indicator for each componentcarrier impacted by a corresponding P-PR; or (2) a single dominationindicator associated with the WTRU.

In one embodiment, the setting of the domination indicator may includesetting the domination indicator to one of: (1) a first logic levelresponsive to the backoff value being impacted by the P-PR; or (2) asecond logic level responsive to the power backoff not being impacted bythe P-PR.

In one embodiment, a method of managing power headroom reports (PHRs)associated with a wireless transmit/receive unit (WTRU), may comprise:determining whether a real transmission is to occur for a componentcarrier (CC) at a first period; determining a previous period when areal transmission occurred for the CC; comparing the P-PR of the CCassociated with the first period with the P-PR of the CC associated withthe previous period; and triggering a PHR in accordance with acomparison result.

In one embodiment, the triggering of the PHR that is associated with theCC to be reported may include triggering the PHR in response to the P-PRof the CC associated with the first period differing from the P-PR ofthe CC associated with the previous period by a threshold.

In one embodiment, the determining of whether the real transmission isto occur for the CC at the first period may include determining whetherany UL resources are to be used for the CC at the first period.

In one embodiment, the determining whether any UL resources are to beused for the CC at the first period may include determining whethereither PUSCH or PUCCH signaling occurred for the CC at the first period.

In one embodiment, the first period may be a period associated with acurrent transmission time interval and the previous period may be aperiod associated with a closest, previous transmission time interval inwhich the PHR was sent by the WTRU which included a power headroomcorresponding to a real transmission for the CC.

In one embodiment, the comparing of the P-PR of the CC associated withthe first period with a P-PR of the CC associated with the previousperiod may include: obtaining the P-PR of the CC associated with thefirst period; obtaining the P-PR of the CC associated with the previousperiod; and determining whether the P-PR of the CC associated with thefirst period differs from the P-PR of the CC associated with theprevious period by a threshold.

In one embodiment, the previous period may be a most recent period a PHRwas sent by the WTRU which included a power headroom corresponding to areal transmission for the CC.

In one embodiment, the first period may be a period associated with acurrent transmission time interval and the previous period may be aperiod associated with a closest, previous transmission time interval inwhich the PHR was sent by the WTRU which included a power headroomcorresponding to a real transmission for the CC.

In one embodiment, the triggering of the power headroom report mayinclude triggering the power headroom report in transmission timeintervals in which the WTRU has uplink resources for a new transmission,exclusive of transmission time intervals in which the WTRU does not haveuplink resources for a new transmission.

In one embodiment, the triggering of the power headroom report mayinclude triggering the power headroom report in transmission timeintervals in which the WTRU has a PHR prohibit timer that expires or hasexpired, exclusive of transmission time intervals in which the WTRU doesnot have the PHR prohibit timer that expires or has expired.

In one embodiment, a method of managing power headroom reportingassociated with a wireless transmit/receive unit (WTRU), may comprise:determining whether to trigger power headroom reports based a length andan amount of change in Power Management Power Reductions (P-PRs), as adetermined result; and triggering reporting of power headroom based onthe determined result.

In one embodiment, a method of managing power headroom reportingassociated with a wireless transmit/receive unit (WTRU), may comprise:determining whether a condition associated with Power Management PowerReductions (P-PRs) taken over a plurality of transmission time intervals(TTIs) has changed temporarily, as a determined result; and triggeringreporting of power headroom based on the determined result.

In one embodiment, the method may further comprise determining the P-PRsfor the plurality of TTIs by successively determining, by the WTRU, theP-PR during respectively different TTIs.

In one embodiment, the determining of whether the condition has changedtemporarily may include determining whether values of the P-PR duringthe TTIs have changed to satisfy the condition for more than a thresholdperiod.

In one embodiment, the determining whether values of the P-PR during theTTIs have changed to satisfy the condition for more than the thresholdperiod may include setting a specified period relative to a currenttime, as a lookback window; and determining whether the condition issatisfied in the lookback window.

In one embodiment, the determining of whether the condition is satisfiedin the lookback window may include determining whether the conditionexists for at least a portion of the lookback window of more than thethreshold period.

In one embodiment, the setting of the threshold period relative to acurrent time, as a lookback window may include setting the lookbackwindow to be a specified period relative to the current time.

In one embodiment, the method may further comprise changing the lookbackwindow as the current time changes.

In one embodiment, the triggering of reporting of power headroom mayinclude: responsive to a previous power headroom report being triggeredwithin a trigger prohibit time, preventing, the triggering of the powerheadroom report until the trigger prohibit time is exceeded.

In one embodiment, the method may further comprise calculating a backoffvalue reported in the power headroom report using a P-PR associated withone or more of the plurality of P-PRs associated with the look backwindow.

In one embodiment, the calculating of the backoff value reported in thepower headroom report may be repeated for each active component carrierhaving an uplink grant

In one embodiment, the calculating of the backoff value may includedetermining one value of: (1) a highest value of P-PR; (2) a lowestvalue of P-PR; (3) a mean value of P-PR; or (4) a median value of P-PR;and including the determined one value in the power headroom report.

In one embodiment, the method may further comprise modifying a PHRtrigger due to power management backoff (P-PR) to eliminate bias causedby reports of virtual headroom in the PHR.

In one embodiment, a method of managing power headroom reportingassociated with a wireless transmit/receive unit (WTRU), may comprise:determining a first backoff value indicating a first reduction in avalue of the transmission power for the WTRU associated with at leastone of: (1) Maximum Power Reduction (MPR) or (2) Additional MPR (A-MPR);determining a second backoff value indicating a second reduction in thevalue of the transmission power for the WTRU based on Power ManagementPower Reduction (P-PR); selecting one of the first or second backoffvalues based which of the first or second backoff values dominates; andreporting power headroom in accordance with the selected backoff value.

In one embodiment, a method, implemented by a wireless transmit/receiveunit (WTRU), of managing transmission power, may comprise: triggering,during a transmission timing interval (TTI), a power headroom report(PHR) based on changes to backoff or the impacts of backoff, such thatthe backoff is a larger value of Power Management Power Reduction andanother value; and transmitting the PHR during the TTI.

In one embodiment, a method, implemented by a wireless transmit/receiveunit (WTRU), of managing transmission power, may comprise triggering apower headroom report (PHR) based on changes to backoff or the impactsof backoff, wherein a power management based backoff is used tocalculate a maximum output power of the WTRU.

In one embodiment, a method, implemented by a wireless transmit/receiveunit (WTRU), of managing transmission power, may comprise: triggering apower headroom report (PHR) based on changes to backoff or the impactsof backoff, wherein power management based backoff is used to calculatea maximum output power of the WTRU; and eliminating PHR triggers causedby virtual PHRs.

In one embodiment, the method may further comprise modifying a PHRtrigger due to power management based backoff to eliminate bias causedby reports of virtual headroom in the PHR.

In one embodiment, the method may further comprise calculating the powerheadroom as a difference between the WTRU calculated transmit power anda configured maximum output power.

In one embodiment, the calculating of the power headroom may includecomputing a value used for power headroom for each of a plurality ofcomponent carriers (CCs).

In one embodiment, the method may further comprise determining a backoffvalue based on maximum power reduction (MPR), additional MPR (A-MPR) andnon-MPR effects, the non-MPR effects corresponding to the powermanagement based backoff.

In one embodiment, the method may further comprise applying theMPR/A-MPR in parallel with the non-MPR effects.

In one embodiment, non-MPR effects may reduce a maximum output power percomponent carrier in a subframe.

In one embodiment, the triggering of the PHR may include triggering PHRgeneration in response to detection of a change in the power managementbased backoff.

In one embodiment, the method may further comprise indicating in the PHRhow the power management based backoff affects the maximum output powerfor each component carrier reported.

In one embodiment, the triggering of the PHR may include triggering on acondition that the power management based backoff affects the maximumoutput power for each component carrier value by more than a threshold.

In one embodiment, the method may further comprise applying a changedpower management based backoff in response to a changed maximum outputpower per component carrier value reported by the WTRU in the PHR.

In one embodiment, the method may further comprise using, by the WTRU,the power management based backoff when the WTRU is in an ON state.

In one embodiment, on a condition that transmissions are bursty,triggering, by the WTRU, the PHR including a reduced maximum outputpower per component carrier value in response to a first transmissionburst.

In one embodiment, the method may further comprise setting aninformation element burst mode to ON.

In one embodiment, the method may further comprise sending the PHRincluding a maximum output power per component carrier value having aworst case backoff that occurred in a time period since a lastoccurrence of a PHR.

In one embodiment, the method may further comprise reporting a maximumoutput power per component carrier value in a virtual PHR on a conditionthat the maximum output power per component carrier value may beaffected by the power management based backoff.

In one embodiment, the method may further comprise setting a maximumpower output using one of: (1) a first mode based on the WTRU operatingin more than one frequency band; or (2) a second mode based on the WTRUoperating in one frequency band.

In one embodiment, at least one of: a maximum power reduction (MPR), anadditional MPR (A-MPR), a ΔTc, or a power management based backoff maybe different for each band.

In one embodiment, the method may further comprise equally scalingphysical uplink shared channels (PUSCHs) without uplink controlinformation (UCI) on a condition that the UCI is simultaneouslytransmitted on physical uplink control channel (PUCCH) and PUSCH, andthe total transmit power of the WTRU is not to exceed Pcmax, and the sumof PUCCH power plus PUSCH with UCI power is not to exceed Pcmax.

In one embodiment, the method may further comprise scaling the PUSCHwith UCI and not transmitting the PUSCH without the UCI on a conditionthat the total transmit power of the WTRU is to exceed Pcmax, and thesum of PUCCH power plus PUSCH with the UCI power is to exceed Pcmax.

In one embodiment, the power management based backoff may be applied toa minimum bound of a configured maximum transmission power.

In one embodiment, the method may further comprise waiting a time priorto triggering a PHR after changed condition associated with triggering aPHR.

In one embodiment, power backoff values may be component carrier (CC)specific.

In one embodiment, the triggering of the PHR may include triggering thePHR based on a predetermined factor that dominates a maximum powercalculation.

In one embodiment, a method of managing transmission power of a wirelesstransmit/receive unit (WTRU), may comprise: determining a PowerManagement Power Reduction (P-PR); determining a backoff value forreducing a value of maximum transmission power for the WTRU; andadjusting transmission power in accordance with the determined backoffvalue.

In one embodiment, the determining of the backoff value may includecalculating the backoff value based on the P-PR.

In one embodiment the determining of the backoff value may include:determining a further value for reducing a value of maximum transmissionpower for the WTRU; and selecting between one of the further value andthe P-PR, as a selected value.

In one embodiment, the method may further comprise: comparing thefurther value to the P-PR; and responsive to the further value beinggreater than the P-PR, adjusting of the maximum transmission power inaccordance with the further value, exclusive of the P-PR.

In one embodiment, the method may further comprise: comparing thefurther value to the P-PR; and responsive to the further value beingless than the P-PR, adjusting of the maximum transmission power inaccordance with the P-PR, exclusive of the further value.

In one embodiment, the further value may be based on a Maximum PowerReduction (MPR), and an Additional MPR (A-MPR) for each componentcarrier used for transmission by the WTRU.

In one embodiment, the method may further comprise: determining whethera sum of powers of the component carriers of the WTRU exceed the maximumtransmission power, as a determined result; and scaling a transmissionpower of the component carriers used for transmission by the WTRU suchthat a composite of the scaled transmission power does not exceed themaximum transmission power in accordance with the determined result.

In one embodiment, the method may further comprise: configuring maximumoutput power between an upper bound and a lower bound where the lowerbound is set by the following equation:

PCMAX_(—) L=MIN{PEMAX,−ΔTC,PPowerClass−MAX(MPR+A-MPR,P-PR)−ΔTC,}

where PEMAX is a quantity signaled to the WTRU, ΔTC, is a powerreduction that is based on the WTRU transmission frequency,P_(PowerClass) is the maximum power of the WTRU's power class, MPR is aMaximum power reduction for the WTRU, A-MPR is a additional MPR, andP-PR is a power management power reduction.

In one embodiment, the method may further comprise: configuring maximumoutput power for an individual component carrier between an upper boundand a lower bound where the lower bound is set by the followingequation:

PCMAX_(—) L,c=MIN{PEMAX,c−ΔTC,c,PPowerClass−MAX(MPR+A-MPR,P-PR)−ΔTC,c}

where PEMAX,c is a quantity signaled to the WTRU, ΔTC,c, is a powerreduction that is based on the WTRU transmission frequency for theindividual component carrier, PPowerClass is the maximum power of theWTRU's power class, MPR is a Maximum power reduction for the WTRU, A-MPRis a additional MPR, and P-PR is a power management power reduction.

In one embodiment, the method may further comprise: responsive to a sumof the WTRU computed powers for the uplink component carriers (CCs)without scaling exceeding a maximum transmission power limit, scaling,by the WTRU, the CC powers before transmission to avoid exceeding themaximum transmission power limit.

In one embodiment, a method of managing transmission power of a wirelesstransmit/receive unit (WTRU), may comprise determining whether acondition associated with Power Management Power Reductions (P-PRs)taken over a plurality of transmission time intervals (TTIs) has changedtemporarily, as a determined result; and adjusting power transmission ofthe WTRU based on the determined result.

In one embodiment, the method may further comprise determining the P-PRsfor the plurality of TTIs by successively measuring, by the WTRU, theP-PR during a respectively different TTI.

In one embodiment, the determining of whether the condition has changedtemporarily may include determining whether values of the P-PR duringthe TTIs have changed to satisfy the condition for more than a thresholdperiod.

In one embodiment, determining whether values of the P-PR during theTTIs have changed to satisfy the condition for more than the thresholdperiod may include: setting a specified period relative to a currenttime, as a lookback window; and determining whether the condition issatisfied in the lookback window.

In one embodiment, the determining of whether the condition is satisfiedin the lookback window may include determining whether the conditionexists for at least a portion of the lookback window of more than thethreshold period.

In one embodiment, the setting the threshold period relative to acurrent time, as a lookback window may include setting the lookbackwindow to be a specified period relative to the current time.

In one embodiment, the method may further comprise changing the lookbackwindow as the current time changes.

In one embodiment, the calculating of the backoff value may includedetermining one value of: (1) a highest value of P-PR; (2) a lowestvalue of P-PR; (3) a mean value of P-PR; or (4) a median value of P-PR;and using the determined value in the adjusting of the maximumtransmission power of the WTRU.

In one embodiment, a wireless transmit/receive unit (WTRU) configured toreport power headroom, may comprise: a processor configured to:determine a Power Management Power Reduction (P-PR) and determine abackoff value for reducing a value of maximum transmission power for theWTRU; and a transmit/receive unit configured to report power headroom inaccordance with the backoff value determined by the processor.

In one embodiment, the processor may be configured to calculate thebackoff value based on the P-PR.

In one embodiment, the processor may be configured to determine afurther value for reducing a value of maximum transmission power for theWTRU; select between one of the further value and the P-PR, as aselected value; and calculate the backoff value based on the selectedvalue.

In one embodiment, the processor may be configured to at least calculatethe P-PR based on at least a specific absorption rate (SAR) indicating arate of absorption of radio frequency energy associated with the WTRU.

In one embodiment, the processor may be configured to: compare thefurther value to the P-PR; and responsive to the further value beinggreater than the P-PR, calculate the backoff value in accordance withthe further value, exclusive of the P-PR.

In one embodiment, the processor may be configured to: compare thefurther value to the P-PR; and responsive to the further value beingless than the P-PR, calculate the backoff value in accordance with theP-PR, exclusive of the further value.

In one embodiment, the processor may be configured to base the furthervalue is on a Maximum Power Reduction (MPR), and an Additional MPR(A-MPR).

In one embodiment, the processor may be configured to calculate thefurther value by algebraically combining values based on the MPR and theA-MPR.

In one embodiment, the processor may be configured to associate theP-PR, the backoff value and the power headroom reporting with one of:(1) a component carrier associated with the WTRU or (2) a composite ofthe component carriers associated with the WTRU.

In one embodiment, the transmit/receive unit may be configured to send,for each component carrier, a power headroom report associatedtherewith.

In one embodiment, the transmit/receive unit may be configured to send acomposite power headroom report via radio resource control signalingcomputed from power backoffs associated with individual, activecomponent carriers of the WTRU.

In one embodiment, the processor may be configured to calculate amaximum output power using the maximum of the further value and theP-PR.

In one embodiment, the processor may be configured to calculate amaximum power output using the maximum of the P-PR and a composite ofthe further value and another value.

In one embodiment, the processor may be configured to set a maximumoutput power between an upper bound and a lower bound where the lowerbound is set by the following equation:

PCMAX_(—) L=MIN{PEMAX,−ΔTC,PPowerClass−MAX(MPR+A-MPR,P-PR)−ΔTC,}

where PEMAX is a quantity signaled to the WTRU, ΔTC is a power reductionthat is based on the WTRU transmission frequency, PPowerClass is themaximum power of the WTRU's power class, MPR is a Maximum powerreduction for the WTRU, A-MPR is a additional MPR, and P-PR is a powermanagement power reduction.

In one embodiment, the processor may be configured to set a maximumoutput power for an individual component carrier between an upper boundand a lower bound where the lower bound is set by the followingequation:

PCMAX_(—) L,c=MIN{PEMAX,c−ΔTC,c,PPowerClass−MAX(MPR+A-MPR,P-PR)−ΔTC,c}

where PEMAX,c is a quantity signaled to the WTRU, ΔTC,c, is a powerreduction that is based on the WTRU transmission frequency for theindividual component carrier, PPowerClass is the maximum power of theWTRU's power class, MPR is a Maximum power reduction for the WTRU, A-MPRis a additional MPR, and P-PR is a power management power reduction.

In one embodiment, the processor may be configured to determine whetherthe WTRU applies the backoff value based on the P-PR; and thetransmit/receive unit may be configured to report to a network resourcethat the WTRU has applied the backoff value based on the P-PR,responsive to the WTRU applying the backoff value based P-PR.

In one embodiment, the processor may be configured to set a dominationindicator when the backoff value is based on P-PR; and thetransmit/receive unit may be configured to send the domination indicatorto the network resource.

In one embodiment, the processor may be configured to set a dominationindicator, as a media access controller (MAC) control element (CE); andthe transmit/receive unit may be configured to send the MAC CE to thenetwork resource.

In one embodiment, the processor may be configured to set one of: (1) arespective domination indicator for each component carrier impacted bythe P-PR; or (2) a single domination indicator associated with the WTRU.

In one embodiment, the processor may be configured to set the dominationindicator to one of: (1) a first logic level responsive to the backoffvalue being impacted by the P-PR; or (2) a second logic level responsiveto the backoff value not being impacted by the P-PR; and to trigger apower headroom report (PHR).

In one embodiment, a wireless transmit/receive unit (WTRU) configured tomanage power headroom reports (PHRs), may comprise: a processorconfigured to determine whether a real transmission is to occur for acomponent carrier (CC) at a first period; determine a previous periodwhen a real transmission occurred for the CC; compare the P-PR of the CCassociated with the first period with the P-PR of the CC associated withthe previous period; and trigger a PHR in accordance with a comparisonresult.

In one embodiment, the processor may be configured to determine whetheran uplink grant is associated with the component carrier in the firstperiod.

In one embodiment, the processor may be configured to trigger the PHR inresponse to the P-PR of the CC associated with the first perioddiffering from the P-PR of the CC associated with the previous period bya threshold.

In one embodiment, the processor may be configured to obtain the P-PR ofthe CC associated with the first period; obtain the P-PR of the CCassociated with the previous period; and determine whether the P-PR ofthe CC associated with the first period differs from the P-PR of the CCassociated with the previous period by a threshold.

In one embodiment, the processor may be configured to trigger the powerheadroom report in response to the power backoff of the CC associatedwith the first period differing from the power backoff of the CCassociated with the previous period by a threshold.

In one embodiment, the previous period may be a most recent period a PHRwas sent by the WTRU which included a power headroom corresponding to areal transmission for the CC; and the first period may be a periodassociated with a current transmission time interval and the previousperiod is a period associated with a closest, previous transmission timeinterval in which the PHR was sent by the WTRU which included a powerheadroom corresponding to a real transmission for the CC.

In one embodiment, the processor may be configured to trigger the powerheadroom report in transmission time intervals in which the WTRU hasuplink resources for a new transmission on the CC, exclusive oftransmission time intervals in which the WTRU does not have uplinkresources for the new transmission on the CC.

In one embodiment, the processor may be configured to trigger the powerheadroom report in transmission time intervals in which the WTRU has aPHR prohibit timer that expires or has expired, exclusive oftransmission time intervals in which the WTRU does not have the PHRprohibit timer that expires or has expired.

In one embodiment, a wireless transmit/receive unit (WTRU) configured tomanage power headroom reporting, may comprise: a processor configured todetermine whether a condition associated with Power Management PowerReductions (P-PRs) taken over a plurality of transmission time intervals(TTIs) has changed temporarily, as a determined result; and triggerreporting of power headroom based on the determined result.

In one embodiment, the processor may be configured to determine theP-PRs for the plurality of TTIs by successively calculating the P-PRduring respectively different TTIs.

In one embodiment, the processor may be configured to determine whethervalues of the P-PR during the TTIs have changed to satisfy the conditionfor more than a threshold period.

In one embodiment, the processor may be configured to set a specifiedperiod relative to a current time, as a lookback window; and determinewhether the condition is satisfied in the lookback window.

In one embodiment, the processor may be configured to determine whetherthe condition exists for at least a portion of the lookback window ofmore than the threshold period.

In one embodiment, the processor may be configured to set the lookbackwindow to be a specified period relative to the current time.

In one embodiment, the processor may be configured to change thelookback window as the current time changes.

In one embodiment, the processor may be configured to prohibit thetriggering of the power headroom report until the trigger prohibit timeis exceeded, responsive to the power headroom report otherwise beingtriggered within a trigger prohibit time.

In one embodiment, the processor may be configured to calculate abackoff value using a P-PR associated with one or more of the pluralityof P-PRs associated with the lookback window.

In one embodiment, the processor may be configured to determine onevalue of: (1) a highest value of P-PR; (2) a lowest value of P-PR; (3) amean value of P-PR; or (4) a median value of P-PR; and include thedetermined value in the power headroom report.

In one embodiment, the processor may be configured to modify a PHRtrigger due to power management backoff to eliminate bias caused byreports of virtual headroom in the PHR.

In one embodiment, a wireless transmit/receive unit (WTRU) configured tomanage power headroom reporting, further comprises: a processorconfigured to determine a first backoff value indicating a firstreduction in a value of the transmission power for the WTRU based on atleast one of: (1) Maximum Power Reduction (MPR) and (2) Additional MPR(A-MPR); determine a second backoff value indicating a second reductionin the value of the transmission power for the WTRU based on PowerManagement Power Reduction (P-PR); select one of the first or secondbackoff value based which of the first or second backoff valuesdominate; and a transmit/receive unit configured to report powerheadroom in accordance with the backoff value selected by the processor.

In one embodiment, a wireless transmit/receive unit (WTRU) configured tomanage transmission power, may comprise: a processor configured totrigger, during a transmission timing interval (TTI), a power headroomreport (PHR) based on power management changes to backoff or impacts ofthe power management on the backoff; and a transmit/receive unitconfigured to transmit the PHR during the TTI.

In one embodiment, a wireless transmit/receive unit (WTRU) configured tomanage transmission power, may comprise: a processor configured totrigger a power headroom report (PHR) based on changes to backoff or theimpacts of the backoff, wherein a power management based backoff is usedto calculate a maximum output power of the WTRU;

In one embodiment, a wireless transmit/receive unit (WTRU) configured tomanage transmission power, may comprise: a processor configured todetermine a power management based backoff for reducing the transmissionpower; and a transmit/receive unit configured to report the reducedtransmission power based on the determined power management basedbackoff.

In one embodiment, a wireless transmit/receive unit (WTRU) configured tomanage transmission power, may comprise: a processor configured totrigger a power headroom report (PHR) based on changes to backoff or theimpacts of backoff, wherein power management based backoff is used tocalculate a maximum output power of the WTRU; and eliminate PHR triggerscaused by virtual PHRs.

In one embodiment, the processor may be configured to modify a PHRtrigger due to power management based backoff to eliminate bias causedby reports of virtual headroom in the PHR.

In one embodiment, the processor may be configured to calculate thepower headroom as a difference between the WTRUs calculated transmitpower and a configured maximum output power.

In one embodiment, the processor may be configured to compute a valueused for power headroom for each of a plurality of component carriers(CCs).

In one embodiment, the processor may be configured to determine abackoff value based on maximum power reduction (MPR), additional MPR(A-MPR) and non-MPR effects, the non-MPR effects corresponding to thepower management based backoff.

In one embodiment, the processor may be configured to apply theMPR/A-MPR in parallel with the non-MPR effects.

In one embodiment, the non-MPR effects may reduce a maximum output powerper component carrier in a subframe.

In one embodiment, the processor may be configured to trigger PHRgeneration in response to detection of a change in the power managementbased backoff.

In one embodiment, the processor may be configured to indicate in thePHR how the power management based backoff affects the maximum outputpower for each component carrier reported. In one embodiment, theprocessor may be configured to trigger on a condition that the powermanagement based backoff affects the maximum output power for eachcomponent carrier value by more than a threshold.

In one embodiment, the processor may be configured to apply a changedpower management based backoff in response to a changed maximum outputpower per component carrier value reported by the WTRU in the PHR.

In one embodiment, the processor may be configured to use the powermanagement based backoff when the WTRU is in an ON state.

In one embodiment, the processor may be configured to trigger, the PHRincluding a reduced maximum output power per component carrier value inresponse to a first transmission burst on a condition that transmissionsare bursty.

In one embodiment, the processor may be configured to set an informationelement burst mode to ON, on the condition that transmissions arebursty.

In one embodiment, the processor may be configured to send the PHRincluding a maximum output power per component carrier value having aworst case backoff that occurred in a time period since a lastoccurrence of a PHR.

In one embodiment, the transmit/receive unit may be configured to reporta maximum output power per component carrier value in a virtual PHR on acondition that the maximum output power per component carrier value isaffected by the power management based backoff.

In one embodiment, the processor may be configured to set a maximumpower output using one of: (1) a first mode based on the WTRU operatingin more than one frequency band; or (2) a second mode based on the WTRUoperating in one frequency band.

In one embodiment, at least one of: a maximum power reduction (MPR), anadditional MPR (A-MPR), a ΔTc, or a power management based backoff, asthe non-MPR effects is different for each frequency band.

In one embodiment, the processor may be configured to equally scalephysical uplink shared channels (PUSCHs) without uplink controlinformation (UCI) on a condition that the UCI is simultaneouslytransmitted on physical uplink control channel (PUCCH) and PUSCH, totaltransmit power of the WTRU is not to exceed Pcmax, and the sum of PUCCHpower plus PUSCH with UCI power is not to exceed Pcmax.

In one embodiment, the processor may be configured to scale the PUSCHwith UCI and not transmitting the PUSCH without the UCI on a conditionthat total transmit power of the WTRU is to exceed Pcmax, and a sum ofPUCCH power plus PUSCH with the UCI power is to exceed Pcmax.

In one embodiment, the processor may be configured to apply the powermanagement based backoff to a minimum bound of a configured maximumtransmission power.

In one embodiment, the processor may be configured to wait a time priorto triggering a PHR after a changed condition associated with triggeringa PHR.

In one embodiment, the processor may be configured to trigger the PHRbased on a predetermined factor that dominates a maximum powercalculation.

In one embodiment, a non-transitory computer readable storage mediumstoring program code may implement any of the methods herein.

What is claimed is:
 1. A method of managing power headroom reportsassociated with a wireless transmit/receive unit (WTRU), the methodcomprising: determining, for a transmission time interval (TTI), whetherthe WTRU includes at least one real uplink transmission on a servingcell and whether a Power Management Power Reduction (P-MPR) for theserving cell has changed by more than a threshold after a last powerheadroom report was transmitted by the WTRU when the WTRU included atleast one other real uplink transmission on the serving cell; and oncondition that the WTRU, for the TTI, includes the at least one realuplink transmission on the serving cell and that the P-MPR for theserving cell has changed by more than the threshold after the last powerheadroom report was transmitted by the WTRU when the WTRU included theat least one other real uplink transmission on the serving cell,triggering a new power headroom report.
 2. The method of claim 1,wherein the new power headroom report is associated with a current TTIand the last power headroom report is associated with a closest,previous TTI for which the WTRU included any real transmission on theserving cell.
 3. The method of claim 1, wherein the WTRU includes the atleast one real uplink transmission on the serving cell on condition thatany of: (1) the WTRU has an uplink resource grant for transmission onthe serving cell for an associated TTI; (2) the WTRU has an uplinkresource that is allocated for transmission on the serving cell for theassociated TTI; or (3) the WTRU is to provide a Physical Uplink ControlChannel (PUCCH) transmission on the serving cell for the associated TTI.4. The method of claim 3, wherein the WTRU has the uplink resourceallocated for transmission on the serving cell for the associated TTI byuplink grant or by semi-static persistent scheduling.
 5. The method ofclaim 1, wherein the WTRU included the at least one other real uplinktransmission on the serving cell in another TTI that was associated withthe last power headroom report on condition that any of: (1) the WTRUhad an uplink resource grant for transmission on the serving cell forthe other TTI; (2) the WTRU had an uplink resource that was allocatedfor transmission on the serving cell for the other TTI; or (3) the WTRUprovided Physical Uplink Control Channel (PUCCH) transmission on theserving cell for the other TTI.
 6. The method of claim 5, wherein theWTRU has the uplink resource allocated for transmission on the servingcell for the other TTI by uplink grant or by semi-static persistentscheduling.
 7. The method of claim 1, wherein the WTRU triggers the newpower headroom report on further condition that the WTRU has an uplinkresource allocated for new transmission for the TTI.
 8. The method ofclaim 1, wherein the P-MPR is effected by any of: (1) a change in aspecific absorption rate (SAR); (2) a change in proximity of the WTRU toa user of the WTRU; or (3) 1xEV-DO data transmission.
 9. A method ofmanaging power headroom reports associated with a wirelesstransmit/receive unit (WTRU), the method comprising: determining, for atransmission time interval (TTI), whether the WTRU has an uplinkresource grant for transmission on a serving cell, and whether a PowerManagement Power Reduction (P-MPR) for the serving cell has changed bymore than a threshold after a last transmission of a power headroomreport by the WTRU when the WTRU had another uplink resource grant fortransmission on the serving cell; and on condition that the WTRU, forthe TTI, has the uplink resource grant for transmission on the servingcell and that the P-MPR for the serving cell has changed by more thanthe threshold after the last transmission of the power headroom reportby the WTRU when the WTRU had the other uplink resource grant fortransmission on the serving cell, triggering a new power headroomreport.
 10. The method of claim 9, wherein the new power headroom reportis associated with a current TTI and the last power headroom report isassociated with a closest, previous TTI for which the WTRU included anyuplink resource grant.
 11. The method of claim 9, wherein the P-MPR iseffected by any of: (1) a change in a specific absorption rate (SAR);(2) a change in proximity of the WTRU to a user of the WTRU; or (3)1xEV-DO data transmission.
 12. A wireless transmit/receive unit (WTRU)configured to manage power headroom reports, comprising: a processorconfigured to determine, for a transmission time interval (TTI), whetherto include at least one real uplink transmission on a serving cell andwhether a Power Management Power Reduction (P-MPR) for the serving cellhas changed by more than a threshold after a last power headroom reportwas transmitted by the WTRU when at least one other real uplinktransmission was included by the WTRU on the serving cell; and atransmit/receive unit configured to trigger a new power headroom reporton condition that, for the TTI, the at least one real uplinktransmission on the serving cell is included by the WTRU and that theP-MPR for the serving cell has changed by more than the threshold afterthe last power headroom report was transmitted by the WTRU when the atleast one other real uplink transmission was included by the WTRU on theserving cell.
 13. The WTRU of claim 12, wherein the new power headroomreport is associated with a current TTI and the last power headroomreport is associated with a closest, previous TTI for which the WTRUincluded any real transmission on the serving cell.
 14. The WTRU ofclaim 12, wherein the transmit/receive unit is configured to include theat least one real uplink transmission on the serving cell on conditionthat any of: (1) the WTRU has an uplink resource grant for transmissionon the serving cell for an associated TTI; (2) the WTRU has an uplinkresource that is allocated for transmission on the serving cell for theassociated TTI; or (3) the WTRU is to provide a Physical Uplink ControlChannel (PUCCH) transmission on the serving cell for the associated TTI.15. The WTRU of claim 12, wherein the transmit/receive unit isconfigured to receive an allocation of the uplink resource fortransmission on the serving cell for the associated TTI by uplink grantor by semi-static persistent scheduling.
 16. The WTRU of claim 12,wherein the processor is configured to trigger the new power headroomreport on further condition that the WTRU has an uplink resourceallocated for new transmission for the TTI.
 17. The WTRU of claim 12,wherein the processor is configured to maintain a value for P-MPR, whichis effected by any of: (1) a change in a specific absorption rate (SAR);(2) a change in proximity of the WTRU to a user of the WTRU; or (3)1xEV-DO data transmission.
 18. A wireless transmit/receive unit (WTRU)configured to manage power headroom reports, comprising: a processorconfigured to determine, for a transmission time interval (TTI), whetherthe WTRU has an uplink resource grant for transmission on a servingcell, and whether a Power Management Power Reduction (P-MPR) for theserving cell has changed by more than a threshold after a lasttransmission of a power headroom report by the WTRU when the WTRU hadanother uplink resource grant for transmission on the serving cell; and,a transmit/receive unit configured to trigger a new power headroomreport on condition that, for the TTI, the WTRU has the uplink resourcegrant for transmission on the serving cell and that the P-MPR for theserving cell has changed by more than the threshold after the lasttransmission of the power headroom report by the WTRU when the WTRU hadthe other uplink resource grant for transmission on the serving cell.19. The WTRU of claim 18, wherein the new power headroom report isassociated with a current TTI and the last power headroom report isassociated with a closest, previous TTI for which the WTRU included anyuplink resource grant.
 20. The WTRU of claim 18, wherein the processoris configured to maintain a value for P-MPR, which is effected by anyof: (1) a change in a specific absorption rate (SAR); (2) a change inproximity of the WTRU to a user of the WTRU; or (3) 1xEV-DO datatransmission.